Pyrexia is a disease triggered by heat damage factors acting on the human body, and patients may have typical symptoms such as high fever, mental changes, and impaired consciousness, and should seek medical treatment promptly. Pyrexia is divided into exertional pyrexia and non-exertional heat exhaustion, the former is mostly in the high temperature and high humidity environment for physical labor suddenly feel headache, dizziness, confusion, can be accompanied by shortness of breath, nausea, vomiting, followed by rapid increase in body temperature up to 40 ° C or more, accompanied by delirium, coma, etc., the beginning of a large, cold sweat, and then turned to no sweat, flushed or pale. Non-exertional pyrexia is mostly seen in patients with chronic diseases and elderly people, most patients have no sweating, dry and red skin, and their body temperature can be gradually increased to over 40°C. At the beginning of the disease, the patients mainly show abnormal behavior or epileptic seizures, and then delirium, delirium, or coma, and in severe cases, it can be accompanied by low blood pressure, heart failure, pulmonary edema and other comorbid symptoms. Patients with the above symptoms, suspected the existence of pyrexia, should consult a doctor in a timely manner, under the guidance of the doctor to clarify the diagnosis, and follow the doctor’s instructions for appropriate treatment. Avoid prolonged stay in hot and humid environment to avoid pyrexia.