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Myasthenia gravis Myasthenia gravis Overview - What is myasthenia gravis? Myasthenia gravis is an autoimmune condition that causes skeletal muscle weakness. These are the muscles that connect to your bones and help you move. Myasthenia gravis usually targets the muscles in your eyes, face, neck, arms and legs. It can affect your ability to: Move your eyes or blink. Keep your eyes open. Make facial expressions. Chew, swallow and talk. Raise your arms up and lift objects. Walk upstairs or get up from a chair. Muscle weakness gets worse after physical activity and improves after rest. Symptoms usually happen quickly. Myasthenia gravis is a chronic (long-lasting) neuromuscular condition (it affects the junction between your nerves and muscles). There isn’t a cure, but effective treatment can help you manage your symptoms and function well. What are the types of myasthenia gravis? The types of myasthenia gravis include: Autoimmune myasthenia: It’s an autoimmune condition where the cause isn’t well understood but the likely cause is the production of certain types of antibodies (immune system proteins). This is the most common type. Neonatal myasthenia: A fetus gets certain antibodies from their birth mother who has myasthenia gravis. An infant may have a weak cry or sucking reflex at birth. These temporary symptoms usually go away after three months. Congenital myasthenia: It isn’t an autoimmune condition, and a genetic change causes this type. There are two subtypes of ... Aug 6, 2026 Learn more