LAM Action is the UK charity for patients with lymphangioleiomyomatosis (LAM). LAM is a rare multi-system disease, diagnosed mainly in women of childbearing age. It mainly affects the lungs, where it causes excessive growth of smooth muscle cells which progressively destroys lung tissue and erodes lung function. Currently, there is no cure for LAM and little in the way of treatment, so for many patients lung transplantation is the only means of survival. Through its fundraising LAM Action provides support and information for LAM patients and their families, and advances research into LAM.