Sciatica Flares “Out of Nowhere”? Here’s What’s Really Triggering It

Dr. Amy Konvalin explains what’s really going on:

The tipping point

Sciatica is irritation* of the sciatic nerve formed from the L4–S2 nerve roots, and it runs from your lower back through (on each side) your buttock and down your leg, sometimes reaching your foot.

^{*Yes, this may seem like a very mild word for it, given how it feels when experiencing it, but physiologically, that’s what’s happening.}

A flare-up usually starts with a mechanical irritation that triggers your nervous system into a fight or flight response, causing your muscles and tissues to tighten and increase pressure on the nerve (with overcompensation often being something that causes further harm and pain).

There are usually some early warning signs: most people have subtle signs beforehand, like reduced range of motion, increasing muscle tension, stiffness, or mild nerve symptoms. Additionally, your body may signal issues through tight hips, poor lower back movement, weak abdominal activation, shallow breathing, pelvic tension, or just general stiffness.

However, flare-ups often seem sudden because a small movement (like bending or reaching) becomes the tipping point after underlying tension and dysfunction have already been built up.

One thing that a lot of people don’t know is some less obvious triggers, including:

• Stress sensitizes your nervous system, increases muscular tension, and makes your body more reactive, so even simple movements can trigger a flare-up.
• Insufficient sleep reduces your body’s ability to recover and handle physical and emotional stress, increasing your risk of irritation and flare-ups.
• Long periods of sitting reduce movement, create tissue stiffness, and alter your biomechanics, which can compress or irritate the sciatic nerve too.

For more on all of this, enjoy:

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Want to learn more?

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Sciatica Exercises & Home Treatment – by Dr. George Best

Take care!