Myasthenia gravis is a group of neuromuscular junction disorders and is also an autoimmune disease of the nervous system. It primarily involves the production of certain antibodies in the body that attack the acetylcholine receptors on the postsynaptic membrane of the neuromuscular junction. This results in the inability of nerve impulses to be effectively transmitted to the muscles, causing the muscles to lose neural control, leading to weakness of the limbs. This weakness is typically more pronounced in the evening than in the morning, with symptoms being lighter upon waking and worsening in the afternoon. As the disease is caused by an autoimmune response, a major focus of treatment is to suppress this abnormal immune reaction, primarily through the administration of corticosteroids. Additionally, many patients with myasthenia gravis also exhibit thymus abnormalities, necessitating thorough CT examinations of the thymus.