Joint pain is a very common problem with many possible causes - but it's usually a result of injury or arthritis.
The information and advice on this page should not be used to self-diagnose your condition, but it should give you a better idea of what is causing your pain and what you should do.
pain in just one joint
pain in many joints
Pain in just one joint
Of all the joints, the knee joint is probably the most frequently damaged and the most susceptible to pain. But knee pain isn't always a joint problem. Learn about the most common causes of knee pain and what you should do.
The most common and more unusual causes of pain in a single joint are described below.
Worsening of osteoarthritis
In older people, joint pain that gets steadily worse is usually a sign ofosteoarthritis, which is the most common type of arthritis in the UK. It may affect just one joint, or many.
Osteoarthritis causes pain and stiffness because it damages the protective surface of the bones and cause mild swelling of the tissues in and around the joint.
It can sometimes affect younger people, especially those who are overweight or those who have had serious injuries to the joint in the past.
You should see your GP if you think this is the cause of your joint pain.
Inflammation of the joint lining
If you've injured the joint recently and it suddenly becomes painful again, the cause could be inflammation of the thin layer of tissue lining the joints and tendons - a condition called traumatic synovitis. It usually does not to cause any redness or heat.
You should be able to manage injury-related swelling at home withanti-inflammatories, an icepack and rest.
Gout or pseudogout
If the skin over the joint is hot and red, and the pain comes in repeated attacks, the cause is likely to be gout or pseudogout, which are types of arthritis.
Gout is caused by a build-up of uric acid (a waste product) in the body. Uric acid builds up if the kidneys do not excrete it properly or if too much is produced.
If the level becomes very high, crystals form in the joints. The crystals cause the joints to become inflamed and severely painful. You will barely be able to move the joint and may have a slight fever.
Gout usually affects the joint of the big toe first, before affecting other joints. It's important to correctly diagnose gout, as treatment will prevent future attacks of joint pain and disability.
Pseudogout is a similar condition to gout, in that crystals of calcium are deposited in and around the joint. However, unlike gout, pseudogout can affect the knee joint first.
You should see your GP if you think you have either condition.
Damage to the cartilage at the back of the kneecap
Knee pain that feels worse when going up or down stairs could be a sign of a damaged kneecap – a condition called chondromalacia patellae. This shouldn't cause any redness or heat around the knee.
The cause is not really understood, but it can be linked to overuse of the knee.
You can treat this problem yourself with anti-inflammatories, an icepack and rest.
Bleeding into the joint space
If you have recently had an injury to the knee joint, such as a torn ligament or knee fracture, it may cause bleeding into the joint spaces. This is known as haemarthrosis.
This is more likely to happen to people on anticoagulants, such as warfarin.
Signs of haemarthrosis are swelling of the knee, warmth, stiffness and bruising, which occur soon after the injury.
You should go to hospital immediately for treatment if you have a very swollen knee.
Less common causes
Sudden pain in a joint is less commonly caused by:
a fracture (read about a broken arm or wrist, broken leg, broken ankle or hip fracture)
reactive arthritis – which usually develops after an infection and tends to affect young adults
psoriatic arthritis – a type of arthritis that affects up to one in five people with psoriasis
– which can start in just one joint, with the pain coming and going
swelling and tenderness over the bony bump just below the kneecap
Rarely, the cause may be:
septic arthritis – a serious condition that causes a painful, hot, swollen joint that you won't be able to move (sometimes with fever) – see your GP urgently or go to A&E
haemophilia – an inherited condition that affects the blood's ability to clot
a tropical infection
crumbling of the bone (avascular necrosis) – caused by a lack of blood supply
Repeated dislocation of the joint
Pain in many joints
In older people, the commonest cause of joint pain is osteoarthritis. This may affect just one joint, or many.
Many people also have rheumatoid arthritis at the same time.
Rheumatoid arthritis is another type of arthritis that causes pain and swelling in the joints – most commonly the hands, feet and wrists.
The pain may come and go in the early phases, with long periods between attacks.
It can leave you feeling generally unwell and tired.
Psoriatic arthritis affects up to one in five people with psoriasis. This type of arthritis is unpredictable, but flare-ups can be usually be managed with treatment.
Like other types of arthritis, it means that one or more of your joints are inflamed and become swollen, stiff, painful and difficult to move.
A viral infection that causes arthritis
Examples are viral hepatitis (liver inflammation caused by a virus) and rubella (a viral infection that used to be common in children), which can both cause pain in the joints and symptoms of a fever.
The links will take you to more information on these conditions.
A disease of the connective tissue
Widespread joint pain is sometimes a sign of a disease that affects almost all the organs of the body, such as:
lupus – where the immune system mistakenly attacks healthy cells, tissue and organs
scleroderma – where the immune system attacks connective tissue underneath the skin, causing hard, thickened areas of skin
Less common causes
Widespread joint pain can less commonly be caused by:
a rarer type of arthritis – such as anklyosing spondylitis, juvenile arthritis or reactive arthritis
Behçet’s syndrome – a rare and poorly understood condition that causes inflammation of the blood vessels
Henoch-Schönlein purpura – a rare condition, usually seen in children, that causes blood vessels to become inflamed
some treatments – including steroid therapy, isoniazidand hydralazine
hypertrophic pulmonary osteoarthropathy – a rare disorder that causes clubbing of the fingers, seen in people with lung cancer
sarcoidosis – a rare condition that causes small patches of tissue to develop in the organs
The above links will take you to more information on these conditions.
The knee joint is particularly vulnerable to damage and pain because it takes the full weight of your body