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Myasthenia gravis

Also called: Myasthenia gravis, MG

An immune disease that causes muscle weakness that gets worse with use, often droopy eyelids and double vision.

Key signWeakness that worsens through the day
DangerBreathing weakness (crisis)

Overview

Myasthenia gravis blocks signals between nerves and muscles.

Weakness gets worse with activity and better with rest.

Symptoms

Common signs:

  • Droopy eyelids or double vision
  • Double vision or droopy eyelids that get worse when tired

Less common

  • Weak arms or legs
  • Trouble swallowing
  • Weak neck

When to get medical care

Call 911Trouble breathing or swallowing: call 911.
Get care todayWorse weakness.
See a doctor soonNew weakness.

Causes

Immune system.

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 under 40
  • Men over 60

Diagnosis

Blood tests.

Tests

Tests, if needed:

  • Antibody tests:
  • EMG:

Treatment

Pace activities.

Self-care

  • Rest between tasks
  • Rest between tasks
  • Plan activities for the morning

Medicines

Medicines that may help:

MedicineHelps withGood to know
Pyridostigmine
Weakness
Immune treatments
Control

OwieClear doesn't give doses: follow the label or your healthcare professional. Medicine names here are examples, not a full list.

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a neurologist (brain and nerve doctor).

Living with it

Support groups and helplines

Children, pregnancy, and older adults

  • Women under 40 and men over 60: Most common.

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

Well controlled for most.

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

  • Which medicines should I avoid?

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 Myasthenia gravis

Sources

Last updated 2026-11-12.