Knee pain is a common problem that can occur suddenly or over a period of time. There are a number of causes of knee pain, and generally treatment is readily available.
Causes of knee pain
Knee pain may be due to a number of causes.
Injury related causes include:
- damage to parts of the knee, including bone, cartilage, ligaments, tendons or muscles
- bursitis, which is inflammation of the fluid-filled sacs that cushion the knee (known as bursae)
Arthritis related causes include:
Other causes include:
- patellofemoral pain syndrome: pain around the kneecap (patella) where it runs over the end of the thigh bone (femur), sometimes due to the kneecap being poorly aligned
- pain referred from the hip or lower spine
Risk factors of knee pain
You are more likely than others to develop knee pain if you:
- are overweight
- have weak or tight leg muscles
- do certain sports, for example skiing and basketball
- have hurt your knee before
Knee pain symptoms
If you have knee pain, you may get other symptoms such as:
- swelling, redness or heat in the knee
- bruising around the knee
- your knee 'giving way'
- locking or clicking
- inability to straighten your knee
See a doctor if the pain doesn’t improve in a few weeks, if you can’t move your knee or put any weight on it, or if your knee locks or gives way
Go to an emergency department if your knee is very painful, is badly swollen or has changed shape, or if you have a fever and a red and hot knee.
Knee pain diagnosis
Your doctor will talk to you and examine your knee.
Your doctor may order some tests including:
- blood tests
- imaging, such as an x-ray, ultrasound or MRI scan
- knee joint aspirate, where a small amount of fluid is taken from the knee using a needle
Knee pain treatments
If you have knee pain, you can help by avoiding putting weight on it, and using an ice pack for up to 20 minutes every 2 to 3 hours. Painkillers like paracetamol can help with the pain.
Treatment may include:
- medicines, such as pain killers and anti-inflammatories
- strapping or a brace to support the knee
- foot orthotics to improve the way you walk
If you have injured your knee, you can start treatment at home. Read more about initial treatment of knee and other limb injuries.
If you are concerned about your knee pain, visit your doctor or emergency department.
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Last reviewed: January 2019