Myasthenia Gravis
1 medicine
Myasthenia gravis is an autoimmune condition that causes muscle weakness worsening with activity, managed mainly with pyridostigmine and, longer term, immunosuppressive treatment.
Key facts
- Myasthenia gravis is a chronic autoimmune disease in which the immune system attacks the junction between nerve and muscle, weakening the signal that reaches the muscle.
- The hallmark is muscle weakness that worsens with activity and improves with rest, often starting in the eyes or face before spreading.
- First-line symptomatic treatment is pyridostigmine; longer-term control usually adds immunosuppression, overseen by a neurology specialist.
- Sudden severe weakness, difficulty swallowing, or breathing trouble is a medical emergency.
What myasthenia gravis is
Myasthenia gravis is a chronic autoimmune disease in which the immune system attacks the junction between nerve and muscle, the point where a nerve signal normally triggers a muscle to contract. Antibodies block or destroy the receptors on the muscle side, so the signal that arrives is weaker than it should be. It's uncommon overall but can appear in adults of any age and affect any voluntary muscle group.
Symptoms
The defining pattern is weakness that fluctuates: worse with repeated use of a muscle, better after rest. Eye and eyelid muscles are often affected first, causing drooping eyelids or double vision. As the condition progresses, weakness can spread to the face, throat, and limbs, sometimes affecting the muscles used for swallowing, speaking, or breathing.
How myasthenia gravis is treated
There's no cure yet, but symptoms are usually well controlled. The mainstay of symptomatic treatment is pyridostigmine, a cholinesterase inhibitor that lets acetylcholine build up at the nerve-muscle junction, strengthening the signal reaching the muscle. Longer-term management usually adds immunosuppressive treatment to calm the underlying autoimmune attack, reducing how often symptoms flare. A neurology specialist typically oversees care, adjusting the treatment plan as symptoms change over time.
When to see a doctor
See a doctor for new or worsening muscle weakness, especially drooping eyelids, double vision, or a change in speech or swallowing. Sudden severe weakness, difficulty swallowing, or breathing difficulty needs emergency care right away: these can signal a myasthenic crisis, a life-threatening complication of the condition.
This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.