From straight to curly, thick to thin: here’s how hormones and chemotherapy can change your hair

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Head hair comes in many colours, shapes and sizes, and hairstyles are often an expression of personal style or cultural identity.

Many different genes determine our hair texture, thickness and colour. But some people’s hair changes around the time of puberty, pregnancy or after chemotherapy.

So, what can cause hair to become curlier, thicker, thinner or grey?

Curly or straight? How hair follicle shape plays a role

Hair is made of keratin, a strong and insoluble protein. Each hair strand grows from its own hair follicle that extends deep into the skin.

Curly hair forms due to asymmetry of both the hair follicle and the keratin in the hair.

Follicles that produce curly hair are asymmetrical and curved and lie at an angle to the surface of the skin. This kinks the hair as it first grows.

The asymmetry of the hair follicle also causes the keratin to bunch up on one side of the hair strand. This pulls parts of the hair strand closer together into a curl, which maintains the curl as the hair continues to grow.

Follicles that are symmetrical, round and perpendicular to the skin surface produce straight hair.

A diagram shows the hair follicle shape of straight, curly and coiled hair.
Each hair strand grows from its own hair follicle.
Mosterpiece/Shutterstock

Life changes, hair changes

Our hair undergoes repeated cycles throughout life, with different stages of growth and loss.

Each hair follicle contains stem cells, which multiply and grow into a hair strand.

Head hairs spend most of their time in the growth phase, which can last for several years. This is why head hair can grow so long.

Let’s look at the life of a single hair strand. After the growth phase is a transitional phase of about two weeks, where the hair strand stops growing. This is followed by a resting phase where the hair remains in the follicle for a few months before it naturally falls out.

The hair follicle remains in the skin and the stems cells grow a new hair to repeat the cycle.

Each hair on the scalp is replaced every three to five years.

A woman with curly hair works on her computer.
Each hair on the scalp is replaced every three to five years.
Just Life/Shutterstock

Hormone changes during and after pregnancy alter the usual hair cycle

Many women notice their hair is thicker during pregnancy.

During pregnancy, high levels of oestrogen, progesterone and prolactin prolong the resting phase of the hair cycle. This means the hair stays in the hair follicle for longer, with less hair loss.

A drop in hormones a few months after delivery causes increased hair loss. This is due to all the hairs that remained in the resting phase during pregnancy falling out in a fairly synchronised way.

Hair can change around puberty, pregnancy or after chemotherapy

This is related to the genetics of hair shape, which is an example of incomplete dominance.

Incomplete dominance is when there is a middle version of a trait. For hair, we have curly hair and straight hair genes. But when someone has one curly hair gene and one straight hair gene, they can have wavy hair.

Hormonal changes that occur around puberty and pregnancy can affect the function of genes. This can cause the curly hair gene of someone with wavy hair to become more active. This can change their hair from wavy to curly.

Researchers have identified that activating specific genes can change hair in pigs from straight to curly.

Chemotherapy has very visible effects on hair. Chemotherapy kills rapidly dividing cells, including hair follicles, which causes hair loss. Chemotherapy can also have genetic effects that influence hair follicle shape. This can cause hair to regrow with a different shape for the first few cycles of hair regrowth.

A woman with wavy hair looks in a mirror
Your hair can change at different stages of your life.
Igor Ivakhno/Shutterstock

Hormonal changes as we age also affect our hair

Throughout life, thyroid hormones are essential for production of keratin. Low levels of thyroid hormones can cause dry and brittle hair.

Oestrogen and androgens also regulate hair growth and loss, particularly as we age.

Balding in males is due to higher levels of androgens. In particular, high dihydrotestosterone (sometimes shortened to DHT), which is produced in the body from testosterone, has a role in male pattern baldness.

Some women experience female pattern hair loss. This is caused by a combination of genetic factors plus lower levels of oestrogen and higher androgens after menopause. The hair follicles become smaller and smaller until they no longer produce hairs.

Reduced function of the cells that produce melanin (the pigment that gives our hair colour) is what causes greying.The Conversation

Theresa Larkin, Associate professor of Medical Sciences, University of Wollongong

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • Navigating the health-care system is not easy, but you’re not alone.

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    Hello, dear reader!

    This is my first column for Healthy Debate as a Patient Navigator. This column will be devoted to providing patients with information to help them through their journey with the health-care system and answering your questions.

    Here’s a bit about me: I have been a patient partner at The Ottawa Hospital and Ottawa Hospital Research Institute since 2017, and have joined a variety of governance boards that work on patient and caregiver engagement such as the Patient Advisors Network, the Ontario Health East Region Patient and Family Advisory Council and the Equity in Health Systems Lab.

    My journey as a patient partner started much before 2017 though. When I was a teenager, I was diagnosed with a cholesteatoma, a rare and chronic disease that causes the development of fatty tumors in the middle ear. I have had multiple surgeries to try to fix it but will need regular follow-ups to monitor whether the tumor returns. Because of this, I also live with an invisible disability since I have essentially become functionally deaf in one ear and often rely on a hearing aid when I navigate the world.

    Having undergone three surgeries in my adolescent years, it was my experience undergoing surgery for an acute hand and wrist injury following a jet ski accident as an adult that was the catalyst for my decision to become a patient partner. There was an intriguing contrast between how I was cared for at two different health-care institutions, my age being the deciding factor at which hospital I went to (a children’s hospital or an adult one).

    The most memorable example was how, as a teenager or child, you were never left alone before surgery, and nurses and staff took all the time necessary to comfort me and answer my (and my family’s) questions. I also remember how right before putting me to sleep, the whole staff initiated a surgical pause and introduced themselves and explained to me what their role was during my surgery.

    None of that happened as an adult. I was left in a hallway while the operating theater was prepared, anxious and alone with staff walking by not even batting an eye. My questions felt like an annoyance to the care team; as soon as I was wheeled onto the operating room table, the anesthetist quickly put me to sleep. I didn’t even have the time to see who else was there.

    Now don’t get me wrong: I am incredibly appreciative with the quality of care I received, but it was the everyday interactions with the care teams that I felt could be improved. And so, while I was recovering from that surgery, I looked for a way to help other patients and the hospital improve its care. I discovered the hospital’s patient engagement program, applied, and the rest is history!

    Since then, I have worked on a host of patient-centered policy and research projects and fervently advocate that surgical teams adopt a more compassionate approach with patients before and after surgery.

    I’d be happy to talk a bit more about my journey if you ask, but with that out of the way … Welcome to our first patient navigator column about patient engagement.

    Conceptualizing the continuum of Patient Engagement

    In the context of Canadian health care, patient engagement is a multifaceted concept that involves active collaboration between patients, caregivers, health-care providers and researchers. It involves patients and caregivers as active contributors in decision-making processes, health-care services and medical research. Though the concept is not new, the paradigm shift toward patient engagement in Canada started around 2010.

    I like to conceptualize the different levels of patient engagement as a measure of the strength of the relationship between patients and their interlocutors – whether it’s a healthcare provider, administrator or researcher – charted against the duration of the engagement or the scope of input required from the patient.

    Defining different levels of Patient Engagement

    Following the continuum, let’s begin by defining different levels of patient engagement. Bear in mind that these definitions can vary from one organization to another but are useful in generally labelling the level of patient engagement a project has achieved (or wishes to achieve).

    Patient involvement: If the strength of the relationship between patients and their interlocutors is minimal and not time consuming or too onerous, then perhaps it can be categorized as patient involvement. This applies to many instances of transactional engagement.

    Patient advisory/consulting: Right in the middle of our continuum, patients can find themselves engaging in patient advisory or consulting work, where projects are limited in scope and duration or complexity, and the relationship is not as profound as a partnership.

    Patient partnership: The stronger the relationship is between the patient and their interlocutor, and the longer the engagement activity lasts or how much input the patient is providing, the more this situation can be categorized as patient partnership. It is the inverse of patient involvement.

    Examples of the different levels of Patient Engagement

    Let’s pretend you are accompanying a loved one to an appointment to manage a kidney disease, requiring them to undergo dialysis treatment. We’ll use this scenario to exemplify what label could be used to describe the level of engagement.

    Patient involvement: In our case, if your loved one – or you – fills out a satisfaction or feedback survey about your experience in the waiting room and all that needed to be done was to hand it back to the clerk or care team, then, at a basic level, you could likely label this interaction as a form of patient involvement. It can also involve open consultations around a design of a new look and feel for a hospital, or the understandability of a survey or communications product. Interactions with the care team, administrators or researchers are minimal and often transactional.

    Patient advisory/consulting: If your loved one was asked for more detailed information about survey results over the course of a few meetings, this could represent patient advisory/consulting. This could mean that patients meet with program administrators and care providers and share their insights on how things can be improved. It essentially involves patients providing advice to health-care institutions from the perspective of patients, their family members and caregivers.

    Patient advisors or consultants are often appointed by hospitals or academic institutions to offer insights at multiple stages of health-care delivery and research. They can help pilot an initiative based on that feedback or evaluate whether the new solutions are working. Often patient advisors are engaged in smaller-term individual projects and meet with the project team as regularly as required.

    Patient partnership: Going above and beyond patient advisory, if patients have built a trusting relationship with their care team or administrators, they could feel comfortable enough to partner with them and initiate a project of their own. This could be for a project in which they study a different form of treatment to improve patient-centered outcomes (like the time it takes to feel “normal” following a session); it could be working together to identify and remove barriers for other patients that need to access that type of care. These projects are not fulfilled overnight, but require a collaborative, longstanding and trusting relationship between patients and health-care providers, administrators or researchers. It ensures that patients, regardless of severity or chronicity of their illness, can meaningfully contribute their experiences to aid in improving patient care, or develop or implement policies, pilots or research projects from start to finish.

    It is leveraging that lived and living experience to its full extent and having the patient partner involved as an equal voice in the decision-making process for a project – over many months, usually – that the engagement could be labeled a partnership.

    Last words

    The point of this column will be to answer or explore issues or questions related to patient engagement, health communications or even provide some thoughts on how to handle a particular situation.

    I would be happy to collect your questions and feedback at any time, which will help inform future columns. Just email me at max@le-co.ca or connect with me on social media (Linked In, X / Twitter).

    It’s not easy to navigate our health-care systems, but you are not alone.

    This article is republished from healthydebate under a Creative Commons license. Read the original article.

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  • Stop Pain Spreading

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    Put Your Back Into It (Or Don’t)!

    We’ve written before about Managing Chronic Pain (Realistically!), and today we’re going to tackle a particular aspect of chronic pain management.

    • It’s a thing where the advice is going to be “don’t do this”
    • And if you have chronic pain, you will probably respond “yep, I do that”

    However, it’s definitely a case of “when knowing isn’t the problem”, or at the very least, it’s not the whole problem.

    Stop overcompensating and address the thing directly

    We all do it, whether in chronic pain, or just a transient injury. But we all need to do less of it, because it causes a lot of harm.

    Example: you have pain in your right knee, so you sit, stand, walk slightly differently to try to ease that pain. It works, albeit marginally, at least for a while, but now you also have pain in your left hip and your lumbar vertebrae, because of how you leaned a certain way. You adjust how you sit, stand, walk, to try to ease both sets of pain, and before you know it, now your neck also hurts, you have a headache, and you’re sure your digestion isn’t doing what it should and you feel dizzy when you stand. The process continues, and before long, what started off as a pain in one knee has now turned your whole body into a twisted aching wreck.

    What has happened: the overcompensation due to the original pain has unduly stressed a connected part of the body, which we then overcompensate for somewhere else, bringing down the whole body like a set of dominoes.

    For more on this: Understanding How Pain Can Spread

    “Ok, but how? I can’t walk normally on that knee!”

    We’re keeping the knee as an example here, but please bear in mind it could be any chronic pain and resultant disability.

    Note: if you found the word “disability” offputting, please remember: if it adversely affects your abilities, it is a disability. Disabilities are not something that only happen to other people! They will happen to most of us at some point!

    Ask yourself: what can you do, and what can’t you do?

    For example:

    • maybe you can walk, but not normally
    • maybe you can walk normally, but not without great pain
    • maybe you can walk normally, but not at your usual walking pace

    First challenge: accept your limitations. If you can’t walk at your usual walking pace without great pain and/or throwing your posture to the dogs, then walk more slowly. To Hell with societal expectations that it shouldn’t take so long to walk from A to B. Take the time you need.

    Second challenge: accept help. It doesn’t have to be help from another person (although it could be). It might be accepting the help of a cane, or maybe even a wheelchair for “flare-up” days. Society, especially American society which is built on ideas of self-sufficiency, has framed a lot of such options as “giving up”, but if they help you get about your day while minimizing doing further harm to your body, then they can be good and even health-preserving things. Same goes for painkillers if they help you from doing more harm to your body by balling up tension in a part of your body in a way that ends up spreading out and laying ruin to your whole body.

    Speaking of which:

    How Much Does It Hurt? Get The Right Help For Your Pain

    After which, you might want to check out:

    The 7 Approaches To Pain Management

    and

    Science-Based Alternative Pain Relief

    Third challenge: deserves its own section, so…

    Do what you can

    If you have chronic pain (or any chronic illness, really), you are probably fed up of hearing how this latest diet will fix you, or yoga will fix you, and so on. But, while these things may not be miracle cures…

    • A generally better diet really will lessen symptoms and avoid flare-ups (a low-inflammation diet is a great start for lessening the symptoms of a lot of chronic illnesses)
    • Doing what exercise you can, being mindful of your limitations yes but still keeping moving as much as possible, will also prevent (or at least slow) deterioration. Consider consulting a physiotherapist for guidance (a doctor will more likely just say “rest, take it easy”, whereas a physiotherapist will be able to give more practical advice).
    • Getting good sleep may be a nightmare in the case of chronic pain (or other chronic illnesses! Here’s to those late night hyperglycemia incidents for Type 1 Diabetics that then need monitoring for the next few hours while taking insulin and hoping it goes back down) but whatever you can do to prioritize it, do it.

    Want to read more?

    We reviewed a little while ago a great book about this; the title sounds like a lot of woo, but we promise the content is extremely well-referenced science:

    The Pain Relief Secret: How to Retrain Your Nervous System, Heal Your Body, and Overcome Chronic Pain – by Sarah Warren

    …and if your issue is back pain specifically, we highly recommend:

    Healing Back Pain: The Mind-Body Connection – by Dr. John Sarno

    Take care!

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  • 3 Things Everyone Over 50 Must Do Daily for Healthy Feet

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    Will Harlow, the over-50s specialist physio, wants you to be on a good footing:

    Daily steps in the right direction

    The three daily exercises recommended in the video are:

    Exercise 1: Towel Scrunch

    The towel scrunch exercise strengthens the flexor muscles in the feet, improving balance and improving contact with the ground. To do this exercise, sit on a chair with a towel placed on the floor beneath your toes while keeping your heels on the ground. Use only your toes to pull the towel toward your heel, scrunching it up as much as possible. This movement strengthens the arch of the foot and can help alleviate symptoms of flat feet. For best results, practice this exercise for 2–3 minutes once or twice daily. Once you’ve got the hand of doing it sitting, do it while standing.

    Exercise 2: Big Toe Extension

    Big toe extension is an essential exercise for maintaining foot mobility and improving walking kinesthetics by preventing stiffness in the big toe. To do this exercise, keep your foot flat on the floor and try to lift only your big toe while keeping the four other toes firmly pressed down. To be clear, we mean under its own power; not using your hands to help. Many people find this difficult initially, but it’s due to a loss of neural connection rather than muscle strength, so with practice, the ability to isolate the movement improves quite quickly. Perform 10 repetitions in a row, three times per day, for optimal benefits. Once you’ve got the hand of doing it sitting, do it while standing.

    Exercise 3: Calf Stretch

    The calf stretch is an important exercise for maintaining foot health by preventing tight calves, which can contribute to issues like plantar fasciitis and Morton’s neuroma. To do this stretch, place your hands against a wall for support and extend one leg straight behind you while keeping your other heel firmly on the floor. The front knee should be bent while the back leg remains straight, creating a stretch in the calf. Hold this position for 30 seconds (building up to that, if necessary). Since the effectiveness of stretching comes from frequency rather than duration, this stretch should be performed three to four times per day for the best results.

    For more on each of these, plus visual demonstrations, enjoy:

    Click Here If The Embedded Video Doesn’t Load Automatically!

    Want to learn more?

    You might also like to read:

    Steps For Keeping Your Feet A Healthy Foundation ← this one’s about general habits, not exercises

    Take care!

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Related Posts

  • Debate over tongue tie procedures in babies continues. Here’s why it can be beneficial for some infants
  • Avocado Oil vs Olive Oil – Which is Healthier?

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    Our Verdict

    When comparing avocado oil to olive oil, we picked the olive oil.

    Why?

    Avocados and olives are both very healthy foods. However, when they are made into oils, there’s an important distinguishing factor:

    Olive oil usually retains a lot of the micronutrients from the olives (including vitamins E and K), whereas no measurable micronutrients usually remain in avocado oil.

    So while both olive oil and avocado oil have a similar (excellent; very heart-healthy!) lipids profile, the olive oil has some bonuses that the avocado oil doesn’t.

    We haven’t written about the nutritional profiles of either avocados or olives yet, but here’s what we had to say on the different kinds of olive oil available:

    Is “Extra Virgin” Worth It?

    And here’s an example of a good one on Amazon, for your convenience 😎

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  • What is ‘doll therapy’ for people with dementia? And is it backed by science?

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    The way people living with dementia experience the world can change as the disease progresses. Their sense of reality or place in time can become distorted, which can cause agitation and distress.

    One of the best ways to support people experiencing changes in perception and behaviour is to manage their environment. This can have profound benefits including reducing the need for sedatives.

    One such strategy is the use of dolls as comfort aids.

    Jack Cronkhite/Shutterstock

    What is ‘doll therapy’?

    More appropriately referred to as “child representation”, lifelike dolls (also known as empathy dolls) can provide comfort for some people with dementia.

    Memories from the distant past are often more salient than more recent events in dementia. This means that past experiences of parenthood and caring for young children may feel more “real” to a person with dementia than where they are now.

    Hallucinations or delusions may also occur, where a person hears a baby crying or fears they have lost their baby.

    Providing a doll can be a tangible way of reducing distress without invalidating the experience of the person with dementia.

    Some people believe the doll is real

    A recent case involving an aged care nurse mistreating a dementia patient’s therapy doll highlights the importance of appropriate training and support for care workers in this area.

    For those who do become attached to a therapeutic doll, they will treat the doll as a real baby needing care and may therefore have a profound emotional response if the doll is mishandled.

    It’s important to be guided by the person with dementia and only act as if it’s a real baby if the person themselves believes that is the case.

    What does the evidence say about their use?

    Evidence shows the use of empathy dolls may help reduce agitation and anxiety and improve overall quality of life in people living with dementia.

    Child representation therapy falls under the banner of non-pharmacological approaches to dementia care. More specifically, the attachment to the doll may act as a form of reminiscence therapy, which involves using prompts to reconnect with past experiences.

    Interacting with the dolls may also act as a form of sensory stimulation, where the person with dementia may gain comfort from touching and holding the doll. Sensory stimulation may support emotional well-being and aid commnication.

    However, not all people living with dementia will respond to an empathy doll.

    fizkes/Shutterstock
    It depends on a person’s background. Shutterstock

    The introduction of a therapeutic doll needs to be done in conjunction with careful observation and consideration of the person’s background.

    Empathy dolls may be inappropriate or less effective for those who have not previously cared for children or who may have experienced past birth trauma or the loss of a child.

    Be guided by the person with dementia and how they respond to the doll.

    Are there downsides?

    The approach has attracted some controversy. It has been suggested that child representation therapy “infantilises” people living with dementia and may increase negative stigma.

    Further, the attachment may become so strong that the person with dementia will become upset if someone else picks the doll up. This may create some difficulties in the presence of grandchildren or when cleaning the doll.

    The introduction of child representation therapy may also require additional staff training and time. Non-pharmacological interventions such as child representation, however, have been shown to be cost-effective.

    Could robots be the future?

    The use of more interactive empathy dolls and pet-like robots is also gaining popularity.

    While robots have been shown to be feasible and acceptable in dementia care, there remains some contention about their benefits.

    While some studies have shown positive outcomes, including reduced agitation, others show no improvement in cognition, behaviour or quality of life among people with dementia.

    Advances in artificial intelligence are also being used to help support people living with dementia and inform the community.

    Viv and Friends, for example, are AI companions who appear on a screen and can interact with the person with dementia in real time. The AI character Viv has dementia and was co-created with women living with dementia using verbatim scripts of their words, insights and experiences. While Viv can share her experience of living with dementia, she can also be programmed to talk about common interests, such as gardening.

    These companions are currently being trialled in some residential aged care facilities and to help educate people on the lived experience of dementia.

    How should you respond to your loved one’s empathy doll?

    While child representation can be a useful adjunct in dementia care, it requires sensitivity and appropriate consideration of the person’s needs.

    People living with dementia may not perceive the social world the same way as a person without dementia. But a person living with dementia is not a child and should never be treated as one.

    Ensure all family, friends and care workers are informed about the attachment to the empathy doll to help avoid unintentionally causing distress from inappropriate handling of the doll.

    If using an interactive doll, ensure spare batteries are on hand.

    Finally, it is important to reassess the attachment over time as the person’s response to the empathy doll may change.

    Nikki-Anne Wilson, Postdoctoral Research Fellow, Neuroscience Research Australia (NeuRA), UNSW Sydney

    This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • Blueberries vs Cranberries – Which is Healthier?

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    Our Verdict

    When comparing blueberries to cranberries, we picked the blueberries.

    Why?

    It’s close!

    In terms of macros, blueberries have slightly more protein and carbs, while cranberries have slightly more fiber. We say the extra fiber’s more important than the (even more minimally) extra protein, so this is the slightest of marginal wins for cranberries in this category.

    In the category of vitamins, blueberries have much more of vitamins B1, B2, B3, B9, K, and choline, while cranberries have slightly more of vitamins A, B5, B6, C, and E. That’s a 6:5 win for blueberries, and also, the margins of difference were much greater for blueberries’ vitamins, making this a clearer win for blueberries.

    When it comes to minerals, blueberries have slightly more iron, manganese, phosphorus, and zinc, while cranberries have slightly more calcium. The margins of difference are small in both cases, but this is a 4:1 win for blueberries.

    Both of these berries are famously full of antioxidants; blueberries have more antioxidant power overall, though cranberries have some specific benefits such as being better than antibiotics against UTIs—though there are some contraindications too; check out the link below for more on that!

    All in all, meanwhile, we say that adding up the sections here makes for a win for blueberries, but by all means, enjoy either or both (unless one of the contraindications below applies to you).

    Want to learn more?

    You might like to read:

    Health Benefits Of Cranberries (But: You’d Better Watch Out)

    Take care!

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