38° is considered a fever, whether it is 38.0° or 38.9°, as long as this measurement is correct and accurate. If an infrared meter is used for measurement, it may be inaccurate to measure the value only once and it is recommended to measure it several times or directly with a mercury column thermometer. When this temperature is measured, it is already considered a moderate fever, accompanied by some discomfort, such as muscle aches and pains, headache or fear of cold, sore throat and other symptoms, which can be used to determine the severity. If the fever is severe, you can take some antipyretic drugs to lower the body temperature and relieve the symptoms, and you can also roughly determine which parts of the body are infected based on these accompanying symptoms. If there is coughing and phlegm, respiratory tract infection is suspected, if there is abdominal pain and diarrhea, gastrointestinal tract infection is considered, and if there is frequent, urgent and painful urination, urinary tract infection is considered.