Gout is a common and painful condition that affects the joints. Small crystals form in and around the joint, causing inflammation, pain and swelling. These crystals are made from one of the body’s normal waste products, uric acid. Normally the body rids itself of extra uric acid through the kidneys into the urine. However this does not happen fast enough in people with gout. This causes uric acid levels to build up and the crystals to form.
Who is affected by gout?
There are two main groups of people commonly affected by gout:
- men between the ages of 40 and 50 years
- older people taking diuretics (also known as ‘water pills’ or tablets which help the body get rid of water).
Gout in pre-menopausal women is rare and your doctor may wish to further investigate your symptoms.
What are the symptoms?
An attack of gout usually comes on very quickly, often overnight. The joint becomes very red, swollen and extremely painful. Often the joint is intensely sore to touch. Gout normally affects one joint at a time, often the joint of the big toe. Other joints such as the hands, wrists, knees, ankles and elbows can also be affected by gout.
What causes it?
Gout is usually caused by your kidneys not flushing uric acid out of your body quickly enough. Gout runs in families, although not all family members will be affected. There are some lifestyle factors which may increase your risk of developing gout, including:
- drinking alcohol
- dehydration (not drinking enough water)
- being overweight or overeating
- ‘crash’ dieting or fasting
- eating certain foods (see next page).
Taking diuretics (water tablets) and/or having kidney disease also increases your risk of developing gout.
How is it diagnosed?
Gout is diagnosed by finding crystals of uric acid in fluid taken from your joint. Your doctor may test your urine to see if your body is getting rid of extra amounts of uric acid. Uric acid levels can also be measured by blood tests, however these are not always accurate. Uric acid levels may be normal or even lowered during an attack of gout. Blood tests are most useful in ruling out other types of joint infections or arthritis. X-rays are often normal in the early stages of gout, so are not very useful in diagnosing gout.
The good news is that gout can be prevented. Talk to your doctor about ways of preventing gout, including:
Medicines: There are medicines that can lower uric acid levels in your blood. These medicines need to be taken every day, whether you are having an attack or not.
Alcohol: Cut down the amount of alcohol you drink and avoid drinking a lot of alcohol at one time (binge drinking). Talk to your doctor or visit www.alcohol. gov.au for Australian Government guidelines on recommended alcohol intake.
Weight loss: If you are overweight, lose weight gradually. Make sure you have a healthy diet, as ‘crash’ or ‘starvation diets’ can actually increase uric acid levels. See a dietician for advice.
Changes in your diet: It is believed that some foods may trigger attacks of gout. These foods tend to contain high levels of purines, a substance that can be made into uric acid in the body. However not all purine-rich foods are thought to cause gout. There is also very little scientific proof that avoiding purine-rich foods can successfully reduce gout attacks. See the Gout and diet information sheet for more information about reducing the risk of gout attacks through changes in your diet. Pseudogout is often mistaken as gout as it causes similar symptoms. However it is the result of a different type of crystal, called calcium pyrophosphate crystals, forming in the joint. These crystals tend to form in the cartilage, the smooth coating lining the ends of the bones. Pseudogout is diagnosed by finding calcium pyrophosphate crystals in the fluid of an affected joint. It is a separate condition from gout and may require different treatment.