A person whose body temperature is and exceeds 99 degrees Fahrenheit in the morning has fever. At any time of the day, a temperature in excess of 100 degrees Fahrenheit indicatesÂ a fever.
Normal body temperature keeps changing depending on the time of the day. The hypothalamus is the part of the body that determines the body temperature. When it experiences a temperature that is higher than normal, fever starts to develop. Symptoms associated with fever include shivering, sweating, heading, restlessness, muscles aches, rash, weakness and lack of appetite. Severe fever may lead to confusion, irritability and convulsions.