Lymphangioleiomyomatosis (LAM)

Lymphangioleiomyomatosis, or LAM as it’s usually called, is a rare lung condition that affects a certain type of muscle cell. It occurs almost exclusively in women. The cause of LAM is currently unknown.

Symptoms include breathlessness, which may worsen with time, and it can cause a pneumothorax or collapsed lung.

Because this condition is rare, it may take some time to get a diagnosis. Your doctor will need to consider other possible causes of your symptoms. You may need to have a few tests and you might need to see a specialist.

Useful resources:

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If you're living with a lung condition, you can call our helpline for support or join one of our local support groups.

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Last medically reviewed: December 2016. Due for review: December 2019

This information uses the best available medical evidence and was produced with the support of people living with lung conditions. Find out how we produce our information. If you’d like to see our references get in touch.