Hyperthermia usually refers to an increase in body temperature to between 39.1°C and 41°C. The normal temperature range of the body varies slightly depending on the part of the body being measured. If oral thermometry is chosen, the normal range of body temperature is 36.3°C to 37.2°C; for anal thermometry, the normal range of body temperature is 36.5°C to 37.7°C; and for axillary thermometry, which is the most commonly used method, the normal range of body temperature is 36°C to 37°C. Therefore, a high fever is usually between 39.1°C and 41°C. High fever tends to cause muscle aches, weakness, pallor, or chills as well as headache, dizziness, sore throat, runny nose, nasal congestion, sneezing, and sometimes nausea, vomiting, abdominal pain, and diarrhea. Patients with high fever can use ibuprofen granules, acetaminophen tablets and other drugs with antipyretic and analgesic effects to promote fever reduction. Physical cooling can be combined at the same time. If the patient has a high fever, it is recommended to go to the hospital in time, under the guidance of the doctor for treatment.