The cause of fever is complex and is a symptom of an illness rather than the illness itself. It may be a common cold or inflammation of the tonsils, or it may be a serious disease such as measles, pneumonia, or meningitis. The most important thing is to see a doctor in time to find out the cause of the disease and treat it for the cause of the fever. Abuse of antipyretic and painkillers before the cause is identified can mask the condition, prevent proper diagnosis and delay treatment. Especially in the case of high fever in young children, improper use of antipyretic drugs can also cause increased sweating, sudden drop in body temperature and deficiency.