Back Pain

Why Does My Lower Back Hurt When I Sit?

Reviewed by Dr. Dustin Dukart, DC

You feel fine walking around, then twenty minutes into a car ride or a work session your low back starts aching — and standing back up is a relief. It’s one of the most common patterns people describe, and there are a few reasons it happens.

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What Sitting Actually Does to Your Back

Sitting — especially slumped or unsupported — loads the low back differently than standing does, holds it in one position, and lets the muscles that normally share the load switch off. For a back that’s already irritated, that sustained position is often what tips it into pain.

Worth being honest about the research: large reviews have not found that occupational sitting on its own reliably causes low back pain. It’s better understood as a position that provokes an existing problem than a cause of one.

What Usually Helps

Move sooner, not longer. The most useful change is a short position change every 20–30 minutes — stand, walk to fill a glass of water, do a few gentle backbends. “The best posture is your next posture.”
Support the low back. A small lumbar cushion or a rolled towel behind your belt line keeps the low back from rounding into the chair.
Set the chair up. Hips slightly above knees, feet flat, screen at eye level so you’re not craning forward.
Build tolerance. Longer term, strengthening the hips, glutes, and trunk raises how long you can sit before it bothers you — that’s the part a targeted exercise plan is for.

When It’s Worth Getting Looked At

Book an exam if the pain has lasted more than a couple of weeks, keeps coming back, or is limiting what you can do. See a physician promptly instead if sitting pain comes with numbness in the saddle area, new leg weakness, any loss of bladder or bowel control, pain that’s severe and constant or worse at night, or a fever — those need a medical work-up first.

Getting Relief

Most new patients are seen within a few days. More reading: what actually helps pain from sitting all day, why your back is stiff in the morning too, and the low back pain page.