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Lower back pain from sitting: why it happens and what helps

How to set up your chair, how often to move, and what the research really says about posture.

By the Nourish & Strong team6 min readUpdated November 2026
A man at a home desk leaning back with one hand pressed on his lower back

The short answer: the fix is less about one perfect posture and more about moving often. Arthritis UK says to stand, stretch and walk around at least once an hour. Support your lower back, keep your feet flat, and avoid slouching. Researchers still disagree on how much sitting itself causes back pain, but long spells in one position often make it worse.

It creeps up on you. You sit down feeling fine. Two hours later you stand up in stages, one hand on the desk, waiting for your back to catch up. By the end of the week, even the drive home feels like work.

You probably can’t quit sitting. You can change how you do it.

Why sitting can make your back hurt

The American Academy of Orthopaedic Surgeons says low back pain often gets worse with long periods of sitting. Researchers writing in the Journal of Clinical Medicine in 2024 explain one likely reason. Sitting tends to flatten the natural curve in your lower back, and more of the load falls on your discs and ligaments.

But the same paper is honest about the limits. Some studies link long sitting and poor posture to back pain. Others find no clear link. So sitting may not be the whole story, even if it’s when you feel the pain.

Arthritis UK makes the more useful point: staying in the same or an awkward position may increase your pain or your recovery time. The problem may be the stillness as much as the chair. Even so, the chair counts. The US National Institute of Arthritis and Musculoskeletal and Skin Diseases names poor posture and sitting all day in an uncomfortable chair as desk-job risks.

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How often should you get up?

Nobody has settled on one exact number, and sources give different answers.

  • Arthritis UK: stretch and walk around at least once an hour.
  • Cambridge University Hospitals NHS trust: no one should sit for more than an hour.
  • Cleveland Clinic: in the first 10 to 20 days after back pain starts, sit as little as you can, in spells of 10 to 15 minutes.

The research is thin too. The 2024 paper says breaks are often recommended, and that active breaks reduced discomfort and pain in one review. But it also says there isn’t enough real-world evidence on which breaks work best.

So here’s a fair rule. Get up at least once an hour on normal days, and more often when your back is sore.

How to set up your seat

This advice comes mostly from the Cambridge University Hospitals leaflet on seating, with extra points from Arthritis UK and Cleveland Clinic.

  • Feet: keep them flat on the floor. If they don’t reach, use a footrest.
  • Lower back: sit right back so your pelvis is supported. If the chair doesn’t help, put a lumbar roll or small rolled-up towel behind the bottom of your back.
  • Seat height: the leaflet says to keep your hips slightly higher than your knees. Cleveland Clinic says hips and knees at right angles. Try both and see which feels easier.
  • Avoid: perching on the front of your seat, slouching and sinking into soft sofas.
  • Armrests: set them at elbow height, with your shoulders relaxed.
  • Keyboard: keep your forearms parallel to the floor, with the middle row level with your elbows. Keep your mouse within easy reach.
  • Screen: put it at arm’s length and at eye level.
  • Swivel chair: Cleveland Clinic says to turn your whole body, not twist at the waist.

The leaflet also says to change your position and adjust your seat often. A good setup isn’t something you lock into for the day.

In the car

Cleveland Clinic suggests a lumbar roll behind the curve of your back. Move your seat close enough that your knees stay bent and your feet reach the pedals.

What to do on a break

A short walk is the simple choice. If you can’t leave your desk, these two NHS sitting exercises are quick. The NHS says to use a solid, stable chair without wheels, and to check with a doctor if you’re not sure they suit you.

Hip marching

  1. Sit upright without leaning on the chair back, and hold the sides of the chair.
  2. Lift your left leg with your knee bent, as far as is comfortable. Place your foot down with control.
  3. Repeat with your right leg. Do 5 lifts on each side.

Upper-body twist

  1. Sit upright with your feet flat on the floor. Cross your arms and reach for your shoulders. Move gently, and skip this one if twisting hurts.
  2. Without moving your hips, turn your upper body to the left as far as is comfortable. Hold for 5 seconds.
  3. Repeat to the right. Do 5 on each side.

For more, try our five exercises for lower back pain.

Move more outside your chair

The NHS suggests about 150 minutes of activity a week, and says hitting that target doesn’t fully cancel out long hours of sitting. So both matter. For back pain, it says walking, swimming, yoga and Pilates may help.

If pain shoots down one leg, read about sciatica exercises. If you feel worn out after a day at a desk, see why you might always feel tired.

When to get help

Back pain usually improves within a few weeks. But some signs need quick attention. These come from the NHS.

Call emergency services or go to the emergency department if you have back pain and:

  • Pain, tingling, weakness or numbness in both legs
  • Loss of feeling around your genitals or bottom
  • Changes in your bladder or bowels, such as trouble peeing or losing control of pee or poo
  • Your penis or vagina feels different during sex, you can’t get or keep an erection, or you can’t orgasm
  • Chest pain
  • Pain that started after a serious accident, such as a car crash

Don’t drive yourself. Ask someone to take you, or call an ambulance.

Get urgent medical advice if you feel hot, cold, shivery or generally unwell, or if you have sudden severe pain, or pain that’s getting worse quickly.

See your doctor if:

  • It hasn’t improved after a few weeks of home treatment
  • It stops you doing everyday things, or you’re struggling to cope
  • You’ve lost weight without trying
  • It doesn’t improve with rest, or it’s worse at night

Your next step

Set a repeating one-hour alarm for tomorrow. When it goes off, stand up and walk for a minute. Then fix one thing about your seat, starting with your feet.

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Quick questions

Why does my lower back hurt when I sit but not when I stand?

Sitting tends to flatten the curve in your lower back and load your discs and ligaments, which may be one reason. A doctor or physiotherapist can look at your own pattern if it keeps happening.

How long is too long to sit with back pain?

Sources differ. Arthritis UK says to move at least once an hour, and one NHS trust says no one should sit for more than an hour. Cleveland Clinic suggests 10 to 15 minutes at a time in the first days of acute pain.

Do I need a lumbar support?

Not always. If your chair doesn’t support your lower back, an NHS trust leaflet suggests a lumbar roll or a small rolled-up towel at the bottom of your back.

What is the best sitting position for lower back pain?

We didn’t find one proven best position, and research on posture is mixed. Sit back with your lower back supported and your feet flat, avoid slouching, and change position often.

Is sitting bad for sciatica?

The NHS advises against sitting or lying down for long periods with sciatica, and Cleveland Clinic lists long sitting as a risk factor.

This article is general information, not medical advice. If you’re worried about your back, please talk to your doctor.

Sources