Myasthenia gravis is an autoimmune disease characterized by fluctuating muscle weakness caused by antibodies attacking acetylcholine receptors at the neuromuscular junction. Symptoms include drooping eyelids, double vision, difficulty speaking and swallowing. Diagnosis involves tests like bloodwork, neurological exams, and response to medication. Treatment includes anticholinesterase medications, corticosteroids, immunosuppressants, and sometimes thymectomy. Nursing care focuses on managing symptoms like impaired communication and activity intolerance.