👉 Myasthenia is a rare but potentially fatal autoimmune disorder that affects the muscles and nerves. It can cause severe muscle weakness, fatigue, and difficulty speaking or swallowing. Myasthenia affects both adults and children, with symptoms typically appearing in childhood. The exact cause of myasthenia is not fully understood but it is thought to be caused by a mutation in the myasthenia gravis gene. Treatment options for myasthenia include medication, bone marrow transplant, and aut