How to Adjust Your Ergonomic Office Chair to Help Relieve Back Pain

Sitting in an office chair for long periods can trigger back pain and worsen existing aches. Holding a static position puts extra pressure on your lower back discs, joints, lumbar region and muscles and also strains your upper back and neck. Over time that pressure can lead to lumbar pain, thoracic pain, sciatica and neck and head pain. 

Studies show pressure inside lumbar discs goes up by about 30% when you are seated, and our tendency to slouch adds even more strain to our backs. Choosing an ergonomic chair and using proper office chairs for back support can make a big difference in alleviating and avoiding back pain. We have put together guidelines on setting up and adjusting your ergonomic chair to reduce back pain and ultimately improve comfort when working.

How to Adjust an Ergonomic Office Chair to Relieve Back Pain

There are a number of features that a good chair should have, but the main priority is adjustability. People have different heights, shapes and postures, so no one chair is perfect for everyone. Check the chair measurements against your body and make sure you can change the parts that matter so the chair fits your unique size and posture. A chair that adapts to you helps reduce pain, improve comfort and keep productivity steady.

How do I Adjust the Seat Height to Reduce Back Pain?

The best way to adjust the seat height of your office chair to relieve back pain is to set the seat so your feet sit flat on the floor or on a footrest. Your knees should bend about 90 degrees or be slightly lower than your hips and your thighs should sit parallel to the floor. Your resting eye line should aim at the centre of your screen. If your computer screen sits too high or low, raise or lower the screen so your neck stays relaxed. If you feel heavy pressure under your buttocks, raise the seat a touch. If the front of your legs feel squeezed, lower it a little.

How do I Set My Seat Depth to Prevent Back Pain?

A seat that is too high leaves your feet dangling and increases pressure on the thighs, which can reduce circulation and cause sitting bone pain, sciatica and lower back pain. A seat that is too low makes your knees sit above your hips, which closes the pelvis and misaligns the lumbar curve, leading to poor posture and hunching.

Sit deeply into your chair with your bottom as far back as possible. Adjust the depth of your seat to suit your thigh length. Your seat should support your full thigh length, with a 2-3 finger gap from the front of the seat to the knee crease when sitting deeply in the seat and engaging with the backrest. 

According to Ergopedia, the incorrect seat depth can lead to muscle fatigue:

• Seat is too short: increased pressure on the underside of unsupported thighs and pressure points leading to muscle fatigue, pain and cramping.
• Seat too deep: Can create pressure on the back of the calf, which may lead to  discomfort and pain, restricted blood flow and nerve compression, leg and calf pain and leg cramps. 

How Should I Tilt the Seat to Help My Lower Back?

A slight forward tilt of the seat can be very helpful for lower back issues and lumbar pain. Tilting the seat forward opens the pelvis and encourages the natural S shape of the spine. That alignment eases pressure on discs and can reduce stress that contributes to sciatica. If the seat stays fixed in the wrong angle, it can increase pressure on the pelvis and spine and lead to pain in the lower back, hips and knees. Small changes in tilt make a big difference to comfort and posture. 

How do I Adjust the Back of an Office Chair to Support My Spine?

The backrest height should be adjustable so it supports both your upper and lower back, ideally adjustable from the seated position on a ratchet. When you sit up and press into the backrest, you want full contact across the thoracic area and the lumbar curve sitting in the correct place to support the inward curve of your spine. Many mesh chairs let you change the backrest height while seated using a ratchet style adjustment.

If the backrest sits too high or too low, it can cause muscle strain, spine discomfort and neck and shoulder pain, especially if you already have a condition. Good office chair back pain support starts with a backrest you can position to match your spine.

How do I Adjust Lumbar Support for My Back?

An ergonomic chair should have lumbar adjustment, both in height and depth, to allow you to achieve the proper ‘fit’ and support the natural inward curve of your spine. Lumbar support height is adjusted with the backrest height (on mesh chairs a separate height adjustment). Inflatable lumbar support allows you to fine tune pressure in the lower back as needs change or you fatigue during long work days. Lower back support is particularly important as sitting for long periods without support to the lumbar curve can lead to slouching as you tire. Flattening the natural curve of the spine places extra stress on the structures in the lower back and discs.

Insufficient lumbar support can lead to flattening of the lumbar curve of the spine, spinal and disc issues, hunching and poor posture, lumbar and lower back pain and fatigue. To get a deeper understanding of lower back support, check out our guide on what is lumbar support in ergonomic office chairs.

How Should I Set the Backrest Angle and Tension?

A shaped backrest that matches your spine will offer active support and help correct posture. Sit deeply so your back engages the rest, then unlock the back angle so it can move with you. Movement keeps you mobile and supported and small shifts help redistribute pressure and improve circulation. If your chair lets you set tilt tension, match the resistance to your body weight so you can recline without using excessive force.

A fixed, rigid backrest that does not match your posture can force your spine into an uncomfortable position and cause muscle pain, slouching and fatigue. Being able to recline and return supports both comfort and spinal health.

How Should I Set My Armrests to Reduce Neck and Shoulder Strain?

Armrests take load off the upper spine, shoulders and neck and make slouching less likely. Relax your shoulders and let your upper arms hang comfortably at your sides. Your elbows should sit around 90 degrees so your hands and wrists rest naturally on your keyboard or work surface. Adjust armrest height so your elbows and forearms have support without feeling pushed up. Slide the armrest pad forward or back so your forearms are supported and you can sit close to the desk.

Armrests that sit too high push the shoulders up and create neck tension. Armrests that sit too low encourage hunching and neck strain. Armrests set too deep keep you away from the desk so your forearms lose support and too shallow leaves a gap in support. It’s good to get in the habit of adjusting armrest depths as you change tasks.

Ergonomic Chairs For Back Pain

You should be able to adjust your chair while seated so you can respond to changing tasks and how your body feels. Taking the time to set seat height, seat depth, seat tilt, backrest height, lumbar support, backrest angle and armrests to your body and the kind of work you do is essential. A good chair lets you customise these elements so you stay comfortable and supported during a long day. Using proper office chair back pain support and learning how to adjust the back of an office chair will help reduce pain and keep you working well.

At Ergonomic Chairs Direct, we are one of the UK’s leading manufacturers of ergonomic office chairs for back pain. With over 30 years of industry experience, our office seating is designed in collaboration with physiotherapists to provide back support and long-term health benefits. Explore our selection of back pain office chairs today, or contact us if you have any further questions.

If you’re dealing with discomfort, our article on ergonomic chairs for back pain explains how the right chair can make a real difference at work.