Patients with myasthenia gravis syndrome have symptoms of lower extremity over upper extremity and proximal over distal, often manifesting as a walking pressure gait or a swaying gait, combined with diminished or absent tendon reflexes in the extremities, which can be restored after a short period of forceful contraction of the corresponding muscles. The order of symptoms of myasthenia gravis is usually weakness of the lower extremities, autonomic dysfunction, weakness of the upper extremities, muscle weakness of the cerebral innervation, and individual patients may also have myalgia and myalgias. The symptoms of myasthenia gravis syndrome are summarized as follows: 1. The first symptoms are often manifested in difficulty in standing up, going upstairs or walking, while the shoulder muscle symptoms occur later; 2. The most common symptom is dry mouth caused by reduced saliva secretion, and there are also symptoms such as impotence, constipation, difficulty in urination and reduced sweat, postural hypotension, and abnormal pupillary reflexes. Myasthenia gravis syndrome occurs mostly in men aged 50-70 years, with a 5:1 male to female incidence ratio, and has a subacute onset. The progression of the disease can vary, with muscle weakness and muscle fatigue usually appearing months to years before the discovery of the tumor. The distribution of affected muscle groups differs from that of myasthenia gravis, with the skeletal muscles of the extremities predominating, and the trunk muscles, pelvic girdle muscles, lower extremity muscles, and scapular girdle muscles being particularly symptomatic.