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Lymphangioleiomyomatosis (LAM)

Also called: LAM, lymphangioleiomyomatosis

A rare lung disease in women causing cysts, shortness of breath, and collapsed lungs.

TreatmentSirolimus

Overview

LAM causes small cysts in the lungs and sometimes kidney growths.

It can occur on its own or with tuberous sclerosis.

Symptoms

Common signs:

  • Shortness of breath

Less common

  • Collapsed lung
  • Cough

When to get medical care

Call 911Sudden chest pain.
Get care todayNew or worse symptoms, or symptoms with fever.
See a doctor soonSymptoms that last or keep coming back.

Causes

Unknown.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • Women

Diagnosis

A clinician asks about your symptoms and may order tests.

The exam

A physical exam.

Tests

Tests, if needed:

  • CT:

Treatment

Treatment depends on the cause and how severe it is.

Self-care

  • Avoid estrogen if advised
  • Pulmonary rehab
  • Don't smoke

Prevention

To lower your risk or prevent problems:

  • Avoid estrogen if advised

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a hematologist (blood doctor) if it doesn't go away.

Living with it

Support groups and helplines

Children, pregnancy, and older adults

  • Pregnancy: Can make LAM worse; plan with your team.
  • Women: Almost always.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

Outlook

Sirolimus slows the disease.

Medicine slows it.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • What's causing this?
  • What treatment do you recommend?
  • Is sirolimus right for me?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Lymphangioleiomyomatosis (LAM)

Sources

Last updated 2026-11-12.