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The heat produced during cellular respiration when cells of a living organism like the human body burn energy can be called body heat.

The physiological condition in which an elevated body temperature causes the body to overheat is called fever. The primary symptoms associated with fever are tiredness, hot skin, shivering, dehydration, suffering body ache, looking sick, chills, and general weakness.

The common causes of fever are heat exhaustion, food poisoning, overdressing (mainly in infants), alcohol withdrawal, vaccination, hyperthyroidism, and severe sunburn.

The treatments related to fever are avoiding cold baths, drinking plenty of water or fluids, dabbing oneself with a lukewarm washcloth, and taking paracetamol.

The shivering gets triggered through the hypothalamus through muscle contraction during the onset of a fever. The immune system triggers an involuntary response (shivering) to fight infection through muscle contraction and relaxation to create body heat.