Cushing's syndrome

Cushing’s syndrome, also known as hypercortisolism, is a collection of symptoms that develop due to very high levels of a hormone called cortisol in the body.

The symptoms of Cushing’s syndrome include:

• weight gain
• thinning skin that bruises easily
• reddish-purple stretch marks on the thighs, stomach, buttocks, arms, legs or breasts
• fat deposits that develop in the face, causing it to become round
• decreased interest in sex 

What causes Cushing’s syndrome?

Cushing’s syndrome often develops as a side effect of treatment with corticosteroids. Corticosteroids are widely used to reduce inflammation and treat autoimmune conditions (where the immune system malfunctions and attacks healthy tissue).

People who take high doses of corticosteroids, long-term, often have a build-up of cortisol in their blood. This type of Cushing’s syndrome is sometimes called iatrogenic Cushing’s syndrome.

A less common cause of Cushing’s syndrome is where a tumour (growth) develops inside one of the body's glands, causing it to produce an excessive amount of hormones. This type of Cushing’s syndrome is known as endogenous Cushing’s syndrome.

Read more about the causes of Cushing’s syndrome.

Diagnosing Cushing's syndrome

Cushing’s syndrome can be difficult to diagnose because the symptoms are similar to those of other, more common conditions, such as an underactive thyroid gland and high blood pressure.

Your GP will need to know whether you have been taking medication and you'll probably need to have a urine test, blood test and/or a saliva test to measure the levels of cortisol in your body.

Read more about how Cushing's syndrome is diagnosed.

Treating Cushing’s syndrome

The main treatment for iatrogenic Cushing’s syndrome is to decrease or withdraw the use of corticosteroids. However, this must be done gradually to avoid any unpleasant side effects.

For endogenous Cushing’s syndrome, surgery to remove the tumour is usually recommended. If surgery is unsuccessful, or it is not possible to remove the tumour safely, medication can be used to counter the effects of the high cortisol levels.

Although treatment is effective, it can take some time to bring the symptoms under control. Anytime from a few weeks to a few years in some cases.

Left untreated, Cushing's syndrome can cause high blood pressure which increases the risk of heart attack and stroke.

Read more about treating Cushing’s syndrome.