Everyday health
Why does my lower back hurt when I sit for a long time?
Sitting loads the lumbar discs more than standing does, and holding any single position lets the supporting muscles switch off. Pain that builds through the day and eases when you move is the typical pattern. Pain that radiates below the knee with numbness or weakness is different, and needs medical assessment first.
The giveaway is timing. Discomfort that appears after twenty or thirty minutes of sitting, eases when you stand, and is worse by Friday than Monday, is a loading problem rather than an injury.
What usually helps
- Interrupting the sitting — two minutes of movement every half hour
- Varying the position, including reclining slightly, which reduces disc load compared with sitting bolt upright
- Hip and hamstring mobility, because tight hips pull the pelvis and the lower back compensates
- Building strength in the back and trunk, so it is not only ever asked to hold still
When to see a doctor rather than treat it as posture
Pain radiating below the knee with numbness or weakness, loss of bladder or bowel control, pain after a fall or accident, unexplained weight loss, or fever with back pain. Loss of bladder or bowel control is an emergency — go to hospital.
Still not sure? Call 7696661169 — we would rather explain twice than have you guess once.
People also ask
How do I fix my posture from sitting at a desk all day?
Change position more often than you correct it. The best posture is the next one — sitting well for eight hours still loads the same tissue for eight hours. Set the screen at eye level and the elbows at about 90°, then stand or walk for two minutes every half hour. That interruption matters more than the chair.
Is sitting really as bad as smoking?
No — that comparison overstates it and has been walked back by the researchers whose work produced it. Prolonged sitting is genuinely associated with worse metabolic and cardiovascular outcomes, but the effect is much smaller than smoking, and it is substantially offset by being otherwise active.