Symptoms of muscle weakness vary in different areas and muscles manifested. Common symptoms of muscle weakness mainly include ptosis, diplopia, limb weakness, chewing weakness, dysphagia and unsteady gait. Ocular muscle weakness can be characterized by ptosis and diplopia. Weakness of facial muscles and oropharyngeal muscles may be characterized by reduced facial expression, slurred speech, continuous chewing weakness and choking on drinking water. Involvement of the sternocleidomastoid and trapezius muscles may result in weakness of head lifting, neck turning, and shoulder shrugging, and if the respiratory muscles are involved, dyspnea may occur. Myasthenia gravis can be caused by neuromuscular junction transmission disorders, viral infections, psychiatric factors, endocrine dysfunction and autoimmune diseases. Early treatment: avoiding exertion and changing bad habits, preventing cold and flu, and supplementing nutrition; etiological treatment. If there is any discomfort, it is recommended to go to the Department of Neurology for consultation and treatment, and not to blindly treat the condition by oneself in order to avoid delaying the condition.