THURSDAY, Oct. 23, 2025 (HealthDay News) — Autoimmune neuromuscular diseases may sound complex, but understanding them is the first step to getting the right care and support. Conditions such as Lambert-Eaton myasthenic syndrome (LEMS), myasthenia gravis (MG), and inclusion body myositis (IBM) affect how muscles and nerves communicate, leading to muscle weakness and fatigue.