Myasthenia Gravis :
Myasthenia gravis is a chronic autoimmune disorder that can cause weakness of skeletal muscle. It develops when the antibodies attack the muscle's normal receptors. Symptoms may include visual problems, drooping eyelids, double vision, muscle weakness, fatigue, facial muscle involvement, snarl-like smile, mask-like appearance, trouble pronouncing words, trouble swallowing, and weakness in the limbs and neck. Diagnosis can be made by blood tests, genetic tests, nerve conduction studies, and electromyograms. It can be treated with medicines like steroids, thymectomy, plasmapheresis, and immunoglobulin. Complications of myasthenia gravis are myasthenia crisis, blockage of airways, respiratory infection, emotional stress, and surgery. It can be prevented by taking anticholinesterase medicines and by avoiding crowds and contact with respiratory infection people.