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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 shouldn't be used to self-diagnose your condition, but may give you a better idea of what's causing your pain.
It covers other possible causes of:
The knee joint is probably the most frequently damaged joint and is particularly vulnerable as it takes the full weight of your body.
However, 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.
If you've injured the joint recently and it suddenly becomes painful again, the thin layer of tissue lining the joints and tendons may be inflamed – a condition called traumatic synovitis. It usually doesn't cause any redness or heat.
You should be able to manage injury-related swelling at home with anti-inflammatories, an icepack and rest.
If the skin over the joint is hot and red, and the pain comes in repeated attacks, the cause is likely to be either gout or pseudogout.
Both conditions are types of arthritis.
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, but usually affects the knee joint first.
See your GP if you think you have either condition.
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 isn't 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.
If you've 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.
Signs of haemarthrosis are:
You should go to hospital immediately for treatment if you have a very swollen knee.
Sudden pain in a joint is less commonly caused by:
Rarely, the cause may be:
Rheumatoid arthritis is another type of arthritis that causes pain and swelling in the joints – usually 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. Read more about the symptoms of rheumatoid arthritis.
Psoriatic arthritis affects up to one in five people with psoriasis. This type of arthritis is unpredictable, but flare-ups can 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.
Examples of viral infections which can cause pain in the joints and symptoms of a fever include:
Widespread joint pain is sometimes a sign of a disease that affects almost all the organs of the body, such as:
Widespread joint pain can less commonly be caused by: