Why Sitting Hurts Your Back Or Legs After An Hour

Dr. Amy Konvalin explains (and what to do about it, besides “sit less”):

Is sitting getting on your nerves?

The problem: sitting with your hips bent to about 90° increases tension on the nerves that run from your lower back into your legs, and in a seated position, the low-back muscles often tighten and compress joints and discs, which can increase pressure on those nerves.

Fun fact: posture does matter, but not the way most people think!

Specifically: leaning to one side, crossing your legs, or sitting with one leg tucked changes the forces through your hips and spine and can increase nerve pressure or muscular tension.

The good news is, it’s not usually not stenosis or classic sciatica: spinal stenosis often improves when sitting and sciatica typically affects only one leg, so pain in both legs that appears mainly during sitting is more consistent with nerve sensitization*. In particular, if leg or back symptoms vanish after 3–5 minutes of walking, the problem is often temporary nerve irritation rather than a serious structural issue because movement relieves the tension cycle.

^{*This refers to how nerves leaving your lower back can become mildly irritated, which causes the muscles they supply to contract, and that muscle tightness further irritates the nerves in a feedback loop that, happily, movement can quickly break}

One myth to be aware of is that of “military posture”: aggressively pulling your shoulders back and pushing your chest out can flatten the natural curves of your spine and create unnecessary strain instead of helping.

Another myth is that lumbar rolls will fix everything: they can help some people maintain a curve in the lower back, but if they’re positioned incorrectly or are too large they can worsen symptoms.

The key is, rather than trying to force a “perfect” posture (which usually isn’t anyway), to instead find the neutral position where your body can sit comfortably with minimal muscular effort. If comfortable, place both feet flat on the floor with equal weight and avoid crossing your legs so your pelvis and “sit bones” remain stable.

A particularly important thing that a lot of people miss: aim to keep your hips slightly higher than your knees because this gently tilts your pelvis forwards and makes it easier for your spine to stack naturally.

On which note, if it’s comfortable to do so, sit tall so your head rests above your shoulders and your shoulders above your hips, imagining a string lifting the top of your head upward without forcing your chest or shoulders.

And of course, all the usual standard advices do apply too—sit less often if you can, enjoy movement breaks, stay hydrated, etc.

For more on all of this, enjoy:

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Want to learn more?

You might also like:

Stand Up For Your Health (Or Don’t) ← our main feature on this also includes more things you can do if you must sit, to make sitting less bad!

Take care!