What is fever?
Fevers are simply an increase in body temperature and is a symptom, not an illness in and of itself. Because fevers accompany such a broad range of infections and illness, they are quite common, so it’s hard to imagine anyone not having suffered from the discomfort of a fever. Fevers commonly are caused by viral or bacterial infections and even heat exhaustion and other conditions.
Fever is often accompanied by additional symptoms such as chills and/or sweating, muscle aches, headaches, fatigue, and weakness. Becoming irritable and dehydrated is also common with fever. With the normal average human body temperature at 98.6, a fever is only significant when it reaches 100.4 F.