Some people have no obvious symptoms in the early stage of thymoma. When compressing the surrounding organs, symptoms of muscle weakness, tracheal compression, and superior vena cava compression may appear. 1. Symptoms of muscle weakness. Including ophthalmic muscle weakness, which manifests as drooping upper eyelid, easy fatigue of vision, double vision, etc.; trunk muscle weakness, which manifests as upper limbs can not be lifted for a long period of time, easy fatigue of walking, etc.; medulla oblongata muscle weakness, which manifests as swallowing, chewing, and respiratory muscle paralysis in severe cases. 2. Symptoms of tracheal compression. It manifests as uncontrollable persistent cough, hoarseness, chest tightness, shortness of breath, dull pain in the chest, rapid heartbeat, dyspnea, and cyanosis of lips and mouth. 3. Symptoms of superior vena cava compression. Dizziness, headache, fatigue, night sweats, loss of appetite, weight loss, fever, chills, different degrees of impaired consciousness. It is recommended that people with corresponding clinical symptoms should consult the doctor in time, and have imaging examination, laboratory examination and pathological examination to clarify the etiology and diagnosis.