Hyperthyroidism fever 37.5 ℃ may be hyperthyroidism crisis, but also may be infectious diseases, rheumatic diseases and other diseases caused by, it is recommended to consult a doctor. 1. Hyperthyroidism crisis: Hyperthyroidism may be induced by infection, stress, etc., leading to sweating, elevated body temperature, vomiting, nausea, abdominal pain, irritability, anxiety, delirium, drowsiness and even coma. 2. Infectious diseases: when the patient is infected by bacteria, viruses and other infections can induce fever symptoms, according to the different parts of the clinical manifestations of the infection will be different, such as respiratory infections can be coughing, coughing up sputum and other symptoms, gastrointestinal infections can have abdominal pain, diarrhea and other symptoms. 3. Rheumatic diseases: such as systemic lupus erythematosus and other diseases in the acute exacerbation of the symptoms of fever. Patients with hyperthyroidism who have a body temperature of 37.5 ℃ are advised to go to the hospital and ask the doctor to make a judgment and clarify the cause of the disease.