Transient fever is defined as a transient fever caused by factors such as strenuous exercise, exertion, seizures, vaccination, and so on. Transient fever is a special type of fever, which is caused by a transient dysfunction of the hypothalamic thermoregulatory center due to various factors such as epileptic seizure, vaccination, strenuous exercise and other physiological or non-physiological factors, resulting in a transient fever. The transient fever usually has no obvious physical discomfort after the attack, and can dissipate by itself through the body’s regulation. If the fever occurs after vaccination, taking medication, or abnormal convulsions, it is recommended that the patient should seek medical attention and be given antipyretic medication such as ibuprofen for symptomatic treatment under the monitoring of a specialized doctor, but it is necessary to distinguish whether it is an allergic reaction caused by taking medication or injecting medication. If fever occurs, the patient should actively seek medical advice and follow the doctor’s instructions, and it is not recommended that the patient take medication to reduce fever on his own.