How to Fix Lower Back Pain From Sitting: A Physiotherapist's Guide
If you spend most of your day at a desk, you already know the feeling. By mid-afternoon a dull ache settles into the lower back, standing up takes a second longer than it should, and by evening you are stretching in the kitchen hoping something clicks. Lower back pain from sitting is one of the most common complaints we see at Example Physiotherapy Clinic, and the good news is that for most people it is also one of the most fixable.
This guide explains why sitting loads the lower back the way it does, what you can change today, and when it is time to book an assessment rather than keep experimenting on your own. It is written as general education, not as a diagnosis. If your pain is severe, came on after an injury, or comes with numbness, weakness or changes in bladder or bowel control, contact a clinician or emergency services before trying anything below.
Key Takeaways
- Sitting is not "bad" for your back, but sitting in one position for hours without moving is. The spine and its supporting muscles are built for variety.
- Most desk-related lower back pain is mechanical: it comes from sustained postures, weak or tired trunk muscles and stiff hips, not from structural damage.
- Small, frequent movement breaks reduce pain more reliably than a single long stretch at the end of the day.
- A chair and desk set-up that lets you change position matters more than any single "correct" posture.
- Persistent pain beyond two to three weeks, or pain with nerve symptoms, deserves a professional assessment.
Why Sitting Makes Your Lower Back Hurt
The load on your lumbar spine changes when you sit
When you stand, the natural inward curve of the lower back (the lumbar lordosis) shares the load between the discs, the small joints at the back of each vertebra and the surrounding muscles. When you sit, especially when you slump, that curve flattens. The pelvis tilts backwards, the discs at the base of the spine take more of the pressure, and the muscles that normally hold you upright switch off because the chair is doing the work.
None of this is dangerous in itself. Discs are resilient structures that tolerate pressure well. The trouble is duration. Tissue that is loaded in one direction for eight hours, five days a week, gets sensitised. It starts to complain earlier and louder each day.
Your hips stiffen and your glutes stop working
Sitting keeps the hip flexors at the front of the hip in a shortened position and the gluteal muscles at the back in a lengthened, inactive one. Over months this combination changes how you stand and walk. When the hips cannot extend fully, the lower back compensates by arching more, and that extra movement is often what people feel as pain when they finally stand up.
Fatigue, not weakness, is usually the real problem
Patients often tell us they have a "weak core". In our experience the trunk muscles are rarely weak in the way a gym test would show. They are tired. Holding a static posture is endurance work, and endurance drops sharply when muscles are not given short rests. This is why the single most effective change is usually not a new exercise but a new habit: moving more often.
What to Change Today
Break up sitting every 30 to 45 minutes
Set a timer. When it goes off, stand, walk to get water, or simply shift your weight and reach overhead for twenty seconds. The break does not need to be long. Research on sedentary workers consistently shows that frequent short breaks reduce reported discomfort more than fewer, longer ones.
If a timer feels intrusive, attach movement to something you already do: stand for every phone call, walk during the first minute of every meeting, or drink from a small glass so you have to refill it.
Sit in more than one position
There is no perfect posture. The best posture is the next one. A supportive chair should let you sit upright with your lower back gently curved, but it should also let you recline slightly, perch forward, and tuck one foot under you now and again. Variety spreads the load across different tissues, which is exactly what the spine wants.
Adjust your desk in this order
- Chair height: feet flat, knees at roughly hip height or slightly lower.
- Back support: the curve of the chair should sit in the small of your back. A rolled towel works if the chair has nothing.
- Screen height: top of the screen at eye level so you are not craning forward, which pulls the whole spine into flexion.
- Keyboard and mouse: close enough that your elbows stay by your sides.
A sit-stand desk helps, but only if you actually alternate. Standing all day creates its own problems.
Three exercises that help most people
These are gentle and safe for most people with non-specific lower back pain. Stop if anything sharpens the pain or sends it down the leg.
Seated pelvic tilts. Sit tall, then slowly roll the pelvis backwards so the lower back rounds, then forwards so it arches. Ten slow repetitions, three times a day. This restores the sense of movement in the lumbar spine that sitting takes away.
Hip flexor stretch. Kneel on one knee with the other foot forward. Tuck your tailbone under and gently shift forward until you feel a stretch at the front of the kneeling hip. Hold thirty seconds each side.
Glute bridge. Lie on your back with knees bent. Push through your heels and lift your hips until your body forms a straight line from shoulders to knees. Hold for two seconds and lower. Two sets of ten. This wakes up the gluteal muscles that sitting puts to sleep.
A Simple Daily Routine
| Time | Action | Why it helps | | --- | --- | --- | | Start of work | 2 minutes of pelvic tilts and a hip flexor stretch | Restores movement before the first long sitting block | | Every 30-45 min | Stand, walk or reach overhead for 20-60 seconds | Prevents tissue sensitisation from sustained load | | Lunch | 10-15 minute walk | Extends the hips and loads the spine in a different direction | | Mid-afternoon | Change chair position: recline or perch forward | Spreads load across different structures | | End of day | Glute bridges and a short walk | Rebuilds endurance in the muscles sitting switches off |
Consistency matters more than intensity. Two weeks of this routine is usually enough for most people to notice the afternoon ache arriving later or not at all.
Common Mistakes That Keep the Pain Going
Stretching harder instead of moving more
A long, aggressive hamstring stretch at 6 pm cannot undo eight hours of stillness. If stretching feels good, keep it, but treat it as a supplement to frequent movement rather than a replacement.
Buying a chair and expecting it to do the work
Expensive ergonomic chairs are comfortable, and comfort is worth something. But a chair cannot move for you. Patients who buy the chair and keep the same habits usually come back with the same pain.
Resting completely
Bed rest was standard advice decades ago. It is now known to slow recovery for most mechanical back pain. Gentle activity, including walking, is one of the most reliable treatments available and it is free.
Ignoring sleep and stress
Poor sleep lowers your pain threshold, and stress increases muscle tension around the trunk. If your back is worse during a difficult work period, that is not a coincidence. Addressing the whole picture usually helps the back too.
When to See a Physiotherapist
Most sitting-related back pain improves within a few weeks of changing habits. Book an assessment if:
- The pain has lasted more than two to three weeks despite regular movement.
- It wakes you at night or is worse when lying down.
- It travels below the knee, or comes with pins and needles, numbness or weakness in the leg.
- It started after a fall, lift or accident.
- You have a history of osteoporosis, cancer or long-term steroid use.
Seek urgent medical care, not a physiotherapy appointment, if you notice numbness around the groin or inner thighs, difficulty controlling your bladder or bowel, or weakness in both legs. These are rare but need immediate attention.
At the clinic an assessment usually takes forty-five minutes. We look at how you sit, stand and move, test the strength and endurance of the muscles that support your spine, and check whether the nerves are involved. Treatment is mostly active: a short, specific exercise programme, advice on your set-up and, where useful, hands-on techniques to reduce stiffness so the exercises are easier to do.
Moving Toward a Pain-Free Workday
Lower back pain from sitting is a signal, not a sentence. Your spine is asking for variety, and once you give it regular movement and a little endurance work, it usually stops complaining. Start with the timer, add the three exercises, and give it two weeks. If the pain is still limiting you after that, we are here to help you find what is being missed.
Frequently Asked Questions
Is sitting on an exercise ball better than a chair?
For short periods it can encourage more small movements. For a full workday most people find it tiring and end up slumping anyway. A good chair used with frequent breaks is a more practical option.
Should I use a lumbar support cushion?
If your chair lacks lower back support, a small cushion or rolled towel is a cheap and effective fix. Just avoid one so large that it pushes you into an exaggerated arch.
Can walking really replace exercises?
Walking is one of the best things you can do for a sore lower back. It does not replace the specific exercises for hip mobility and glute endurance, but on days when you cannot fit anything else in, a brisk walk is far better than nothing.
How long until I notice a difference?
Most people feel the afternoon ache arriving later within one to two weeks of regular movement breaks. Endurance improvements from the exercises take four to six weeks.
Is my pain caused by a slipped disc?
Most sitting-related back pain is not. Disc-related pain typically has a different pattern, often with leg symptoms. Only an assessment can tell you, so if you are worried, book one rather than searching for answers online.
Does a standing desk fix the problem?
It gives you another position to alternate with, which is genuinely useful. Standing all day, however, produces its own aches. Aim to switch every thirty to sixty minutes.