Ankylosing spondylitis (AS)

What is ankylosing spondylitis?

Ankylosing spondylitis (AS) (ank-ee-lo-zing spon-dee-li-tus) is a type of arthritis that mainly affects the back, by causing inflammation in the spine. This can make your back, rib cage and neck stiff and painful.

It often starts in people who are in their late teens or 20s.

In response to the inflammation, the body produces extra calcium around the bones of the spine. This can make extra bits of bone grow and cause your back and neck to be more stiff.

In rare cases some of the bones of the spine may link up, or fuse together because of the extra calcium. In serious cases this can make the spine curve forward more. You can reduce the risk of this happening, if you:

  • keep active
  • have effective medical treatment
  • try to maintain a good posture.

While it mainly affects the neck and back, it can also cause pain and stiffness elsewhere in the body, including in the hips, shoulders and feet.

We don’t yet know what causes ankylosing spondylitis. To some extent it’s related to your genes, but the condition isn’t passed directly from a parent to their children. You can’t catch it from anyone else.

The sections of the spine consist of cervical, thoracic, lumbar spine, the sacroiliac joint and the cocyx.

Conditions related to ankylosing spondylitis

Ankylosing spondylitis is a type of spondyloarthritis (spon-dee-lo-arth-rye-tus). This is the name for a group of conditions with similar symptoms – mainly pain and stiffness around the spine.

Here are some other types of spondyloarthritis:

  • Non-radiographic (non-radio-graff-ick) axial spondyloarthritis – the main symptoms are similar to ankylosing spondylitis – pain and stiffness around the spine. But there won’t be physical changes to the back that can be seen on an x-ray. Some people with this condition are later diagnosed with ankylosing spondylitis.
  • Psoriatic (sorry-at-ick) spondyloarthritis is a form of psoriatic arthritis that can occur alongside the skin condition psoriasis. People with psoriasis can get red, scaly patches of skin.
  • Spondyloarthritis associated with inflammatory bowel disease, which is also called enteropathic (en-tur-o-path-ick) arthritis. This is related to bowel conditions such as Crohn’s disease or ulcerative colitis. The bowel is part of the digestive system that helps to break down the food we eat.
  • Reactive arthritis is diagnosed when your arthritis is a reaction to an infection.
  • Enthesitis (en-thur-si-tus)-related juvenile idiopathic arthritis is the name used when children and teenagers develop inflammation in entheses, the sites where tendons and ligaments attach to bones.

The rest of this content refers to ankylosing spondylitis. However, the treatment and self-management advice is very similar for people with other types of spondyloarthritis.


In the early stages, ankylosing spondylitis is likely to cause::

  • stiffness and pain in your lower back in the early morning that lasts at least 30 minutes and then eases through the day or with activity
  • pain that wakes you in the night
  • pain in one or both buttocks and sometimes the backs of the thighs.

The condition can sometimes be mistaken for common backache.

Common backache often comes in short and painful spells. But the pain from ankylosing spondylitis is likely to be long lasting.

You may also have neck, shoulder, hip or thigh pain, which is worse when you’ve not been active for a time, for example if you sit for long periods working at a desk. Some people have pain, stiffness and swelling in their knees or ankles.

The pain and stiffness can vary over time. If most of the spine is affected, it can cause difficulty with activities that involve bending, twisting or turning.

Other possible symptoms include:

  • soreness at the heel or in the arch of your foot
  • pain and swelling in a finger or toe
  • tenderness at the base of your pelvis, which can make sitting on a hard chair uncomfortable
  • chest pain or a tightness around the chest that comes on gradually. This can make it difficult to take deep breaths. Your ribs may feel very tender, and you may find that you’re short of breath after even gentle activity. Coughing or sneezing may cause discomfort or pain.
  • inflammation of the bowel. People with ankylosing spondylitis can develop bowel problems known as inflammatory bowel disease (IBD) or colitis. It’s a good idea to see your doctor if you have diarrhoea for more than two weeks or have bloody or slimy poos.
  • fatigue, which is severe tiredness that doesn’t improve with sleep or rest. This can be caused by the condition itself, as well as by anaemia. This is when people have a lack of red blood cells, which carry oxygen around the body.
  • depression and anxiety.
  • inflammation of the eye, called either uveitis or iritis. The first signs are usually a painful and sometimes red eye. It may become uncomfortable to look at bright lights.

If one or both of your eyes are painful or red, or if you have changes to your vision such as partial loss of sight, blurred vision, floaters or sensitivity to light, it’s very important to get medical help as soon as possible. The best place to go is an eye casualty department. Your optician will be able to tell you where the nearest one is. You could also go to a GP surgery or an accident and emergency department. Treatment is usually with steroid eye drops, which are generally very effective.


If you’ve had ankylosing spondylitis for a long time or if the bones in your back have fused together, you may be at risk of bones in your back fracturing. A fractured bone in your spine can cause nerve damage.

It’s very important that a doctor treating you following a fall or an accident knows that you have ankylosing spondylitis.

If you have new unexplained pain in your spine or new weakness, numbness or tingling in your arms or legs, it’s very important to tell a doctor.

Some people with ankylosing spondylitis develop osteoporosis, a condition that causes bones to thin and be more likely to fracture.

If you have ankylosing spondylitis, or any kind of spondyloarthritis, it can make you slightly more at risk of problems such as a heart attack or a stroke. Taking drugs to reduce inflammation, as well as eating a healthy diet, not smoking and exercising regularly will reduce this risk.

Rarely, the top of your lungs may become scarred if your chest is affected by ankylosing spondylitis.

Although these problems can happen in people with ankylosing spondylitis, they are rare.


Symptoms of ankylosing spondylitis can be similar to more common back problems, especially in the early stages.

Because of this, many people put up with the pain for some time before seeking help. It’s important to see a doctor as soon as possible if you suspect you have ankylosing spondylitis.

It’s usually diagnosed by a rheumatologist, these are doctors who specialise in conditions affecting the joints, bones and muscles.

There is no one test that can show for certain that you have ankylosing spondylitis. A diagnosis will be made based on several things, including:

  • the history of your condition and the symptoms you’ve experienced, including whether pain and discomfort is waking you up during the second half of the night
  • a physical examination
  • blood tests, which may show inflammation
  • x-rays or a magnetic resonance imaging (MRI) scan
  • your age. It can be diagnosed at any age, but most often begins before the age of 40, and often much younger.

There are disease activity and pain scores that can help doctors diagnose ankylosing spondylitis. Your doctor will ask if you have key symptoms, such as swollen and painful joints, especially around the spine, and fatigue. You’ll be asked if you have pain in the mornings and how long for. Your answer to these questions could help lead to a diagnosis.

Blood tests can confirm whether you have the HLA-B27 gene. Most people with ankylosing spondylitis test positive for HLA-B27, but so do many people who don’t have the condition. A positive test may point to someone having ankylosing spondylitis, but it won’t confirm the diagnosis.


A number of treatments can slow it down and treat pain and stiffness. Exercise and close attention to your posture are just as important to keep your spine mobile and help you to live a normal life.

Some of the drugs below can only be prescribed by a rheumatology consultant.

Drug treatments

Painkillers and non-steroidal anti-inflammatory drugs (NSAIDs)

Painkillers, such as paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, are usually the first choice of treatment for ankylosing spondylitis.

For people who have symptoms that can’t be controlled by anti-inflammatories, other drugs are available to help reduce pain or limit the effects of the condition.

Disease-modifying anti-rheumatic drugs (DMARDs)

Drugs such as sulfasalazine and methotrexate, can treat arthritis in your arms and legs, although they’re not usually effective for spinal symptoms.

These drugs, called disease-modifying anti-rheumatic drugs (DMARDs), can reduce the amount of inflammation that happens in your body. This means that as well as treating symptoms, they can help prevent joint damage.

These drugs can sometimes take several weeks or months to take effect. When they do take effect, they can make a big difference to your pain and stiffness. They’re often long-term treatments.

When taking DMARDs, you’ll need regular check-ups and blood tests to monitor their effect.

Biological therapies

Biological therapies are newer treatments that can be very effective for some people with ankylosing spondylitis and related conditions.

These drugs have a more targeted approach to stop inflammation than the older DMARDs.

They aren’t suitable for everyone and can only be prescribed if your condition can’t be controlled with anti-inflammatory drugs and physiotherapy.

There are a group of biological therapies called anti-TNF drugs. The following can treat ankylosing spondylitis:

Secukinumab is a different type of biological therapy that can also treat ankylosing spondylitis. It’s one of a new family of biological therapies called interleukin, or IL-17 inhibitors. This drug also works by reducing or slowing inflammation.

These drugs are given as an injection, which you, or a partner, relative or friend can learn to do.

The effect of biological therapies will be monitored, and you’ll need to complete questionnaires regularly to check how well you’re responding to treatment.


Steroids can be used as a short-term treatment for flare-ups. They’re usually given as an injection into a swollen joint or as a slow-release injection into a muscle. They can also treat painful tendons, for example at the heel, although they aren’t repeated too often as they can cause tendon weakness.

Occasionally, you may be given a course of steroid tablets called prednisolone. While these treatments can be very effective at improving pain and stiffness, you may develop side-effects if you use them for long periods.

If you’ve been prescribed steroid tablets, talk to your doctor about the risk of side effects and how you might be able to reduce your chances of getting them. As with any drug, report any side effects to your doctor immediately.

If you develop eye inflammation, it will usually be treated with steroid eye drops. In more severe cases of eye inflammation, steroids may be given as tablets or as an injection into the eye.

Physical therapies

Physiotherapy is a very important part of the treatment for ankylosing spondylitis. A physiotherapist can put together a programme of exercises to improve your muscle strength and help you maintain mobility in your spine and other joints.

It’s especially important to exercise your back and neck to avoid them stiffening into a bent position.

A physiotherapist will advise you on how to maintain good posture and may be able to offer you hydrotherapy, also known as aquatic therapy. This involves specific exercises for the spine, hips and shoulders carried out in a special warm-water pool.

Many people with ankylosing spondylitis find this therapy helpful and continue their programme at their local swimming pool or with their local National Ankylosing Spondylitis Society (NASS) group.


Most people with ankylosing spondylitis don’t need surgery, although some people may need a hip or knee replacement if these joints are badly affected. This can get rid of pain and improve mobility.

If you’re concerned about your spine being bent, raise this with your rheumatologist. Any decision about surgery is difficult and should also involve an experienced spinal surgeon. Though it’s very rare for people to need surgery on their back because of ankylosing spondylitis, it can dramatically improve some people’s lives.

Living with ankylosing spondylitis

Medical treatments can help control ankylosing spondylitis. And there are also many things you can do to help improve your symptoms.

Keeping active and paying attention to your posture can greatly help you minimise the long-term effects of this condition.

Keeping active

If you have ankylosing spondylitis, keeping active can really help you manage your condition.

Regular exercise is good for the range of movement of your back and to stop your spine from stiffening. Start slowly and gradually build up the amount of exercise you do.

Too much rest will increase the stiffening in your spine.

If you’re in a lot of pain and finding it difficult to exercise, talk to your doctor or a physiotherapist.

As well as being good for your back, exercise is important for your heart and lungs, and your overall health. It can also lift your mood and boost your confidence.

Specific simple exercises for your back, chest and limbs will help keep them supple. You may find stretching exercises after a hot shower or bath are especially helpful to ease stiffness in the morning.

Try to do at least some exercise each day. Remember you can take painkillers beforehand to help you exercise.

We have examples of exercises to help improve strength and flexibility. Try to do them every day.

Pilates, yoga and t’ai chi may be useful as these can help with posture, strength and flexibility. You can ask your physiotherapist for advice if you have any doubts or questions about a particular activity. If you go to a class, tell the instructor about your condition.

Swimming is one of the best forms of exercise because it uses lots of muscles and joints without jarring them. And the water supports the weight of your body. Swimming provides a great overall workout that improves your strength, stamina and flexibility.

Speak to your physiotherapist or a swimming instructor if you have discomfort when swimming, as a different stroke or slight change to your technique could help.

As an alternative to swimming, your local pool might run aerobic classes in shallow or deep water which you could try.

There are many types of exercise that will help maintain your mobility and improve your overall health. The key is to find something you enjoy as this will help you to keep doing it.

The National Ankylosing Spondylitis Society (NASS) offers regular exercise classes, run by physiotherapists, at various centres around the country. NASS can also provide information about gym-based exercise, an exercise DVD and mobile app.

Research and new developments

Previous research has shown that ankylosing spondylitis has a strong genetic component and we’re currently funding several research projects to further understand this. Previously, we part funded research that identified a specific gene, called IL23R, that’s linked to the condition. We’re now funding a follow-on project to investigate how changes in this gene lead to the development of ankylosing spondylitis.

We’re also supporting a study that’s investigating a gene called RUNX3. Researchers are investigating whether this molecule can be targeted with drugs. Results from this research may lead to the development of new and more effective drug treatments.

We’re funding a project investigating the protein HLA-B27. This protein is found in over 90% of people with ankylosing spondylitis. It’s thought that HLA-B27 proteins tend to fold incorrectly inside cells, which may lead to the immune system releasing chemicals that cause inflammation. This research aims to generate HLA-B27 specific treatments that overcome the problems associated with current treatment options.

We’re also supporting research which aims to uncover the link between inflammation of the intestine and ankylosing spondylitis. There’s strong evidence from previous research that the health of the intestine can influence the condition. This research aims to explain how and why this happens, and to identify groups of patients most affected by intestinal inflammation. This could lead to new and improved treatments for this condition.


Stand against a wall

Standing with your heels and backside against a wall, push (but don’t tilt) your head back towards the wall. Hold for 5 seconds then relax. Repeat about 10 times if possible.

Waist turn

Stand in an open space with your feet apart. Place your hands on your hips. Turn from the waist to look behind you. Keep your knees and feet facing the front. Hold for 5 seconds. Repeat to the other side, 5 times each side.

Lay down, knees bent, breathe

Lying on your back, knees bent, feet flat on the ground:

(a) Put your hands on your ribs at the sides of your chest. Breathe in deeply through your nose and out through your mouth, pushing your ribs out against your hands as you breathe in. Repeat about 10 times. Remember, it’s as important to breathe out fully as it is to breathe in deeply.

(b) Put your hands on the upper part of the front of your chest. Breathe in deeply through your nose and then breathe out as far as you can through your mouth. Push your ribs up against your hands as you breathe in – again about 10 times. You can do this exercise at any time in a lying or sitting position.


Lying on your front, looking straight ahead, hands by your sides (if necessary you can put a pillow under your chest to get comfortable).

Raise one leg off the ground keeping your knee straight, about 5 times for each leg. It helps to have the opposite arm stretched out in front of you.

Head and shoulder raise

Lying on your front, looking straight ahead, hands by your sides (if necessary you can put a pillow under your chest to get comfortable):

Raise your head and shoulders off the ground as high as you can – about 10 times.


Kneeling on the floor on all fours, stretch alternate arms and legs out parallel with the floor and hold for 10 seconds. Lower and then repeat with the other arm and leg, 5 times each side.

Ben’s story

Ben, who has ankylosing spondylitis, walking through the forest.

I’ve just spent six months living and working in the Amazon rainforest, in the Manu National Park, in Peru.

For the first three months we learned how to recognise different vegetation, animals and reptiles. Then we trained new volunteers.

A big challenge was not having medication out there, the hot and humid climate helped. Hiking in the jungle six days a week was great for my fitness.

I’ve wanted to visit the Amazon for as long as I can remember. It’s one of the most amazing places on the planet, and it lived up to my expectations. But it’s disappearing quickly.

Even though I’m back in the UK, I’m staying off my medication as much as I can. I’m trying to control it through exercise and stretching. I do yoga, which is good for stretching and relaxing. I’ve also started running.

The exercise I did in the jungle was really good. It drove home how important exercise is and no matter how you feel it’s good to do some. In the long run, it will really help.

There were times before I left and when I first started, I considered cancelling the whole thing. Having arthritis and diabetes and going to such a remote place was scary.

I had a lot of self-doubt. Once I’d been out there for a bit, I knew the days that I should say no to doing things, I knew how to manage it.

Life is for living, and you’ve got to make the most of it.

If that means hobbling around a rainforest, a bit of discomfort is worth it for a once-in-a-life time experience.

If you’re young and have a condition like ankylosing spondylitis, you shouldn’t think it’s the end of the world.

The key is to have faith in yourself, that you are strong enough to overcome the obstacles. But also, be realistic and pre-empt what might be difficult and take steps to overcome or avoid potential problems.

It can be difficult, and there will be days when you won’t want to get out of bed, when everything hurts, and it sucks, but you have to break through it.

As soon as you’re up and moving, the adrenalin takes over and it goes to the back of your mind.

I cannot emphasise strongly enough that you should use the people around you for support. It can take a lot of strength to ask for help, but it’s important to.

In Peru I had a lot of support, and I couldn’t have done many things without people’s help. In the jungle my friends carried my bag when we were hiking if my neck or back were hurting.

I made so many friends for life.

For pictures and information of Ben’s travels and work in the Amazon, visit his website.