Hyperthyroidism can cause systemic multi-system lesions:1. A more common complication is hyperthyroid heart disease, which occurs when the condition of hyperthyroidism is more serious. If hyperthyroidism has a long course, patients without regular treatment or inadequate treatment may develop hyperthyroid heart disease, which is characterized by tachycardia, premature beats, atrial fibrillation, heart enlargement, tightness of the heart after activity, swelling and other heart failure manifestations. The cardiac manifestations caused by hyperthyroidism can be improved or even completely relieved after effective anti-thyroid treatment. 2. Another relatively common complication is proptosis. A trained doctor or even an ordinary hospital staff may know that it is some kind of disease when they see a more special look. The specific manifestations of hyperthyroidism protruding eyes are forward protrusion of the eyeballs, hypertrophy and edema of the eyelids, congestion and edema of the bulbar conjunctiva, and the patient will be afraid of light, tearing and pain in the eyes.