1, ambient temperature, the body temperature of normal people can change with the change of ambient temperature, but generally it will not exceed 1℃.
2, there are pathogen infections in the body, more common in bacteria. When bacteria multiply and release toxins into the blood, it will lead to an increase in body temperature. Because the cycle of bacteria releasing toxins is not fixed, the body temperature will rise and fall.
3. Abnormal structure and function of thermoregulatory center, such as cerebral hemorrhage or massive cerebral infarction, will directly damage thermoregulatory center and cause temperature fluctuation. Patients with autonomic nervous dysfunction will also have abnormal functional thermoregulation.
4, patients with fever, due to intermittent use of antipyretics, can cause high and low body temperature.