The classical illness behaviors such as fever, sleepiness, and lack of appetite are caused by ____.

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The classical illness behaviors such as fever, sleepiness, and lack of appetite are caused by the immune system's production of cytokines, which are chemical signals released in response to infection or injury. These cytokines affect the brain and trigger the behavioral and physiological changes commonly associated with sickness.

The Classical Illness Behaviors Such as Fever, Sleepiness, and Lack