Why your body's defense system makes you feel miserable

The surprising reason you feel awful when you're sick - Marco A. Sotomayor · 5:01 · Video: TED-Ed · Watch at the source

In short: When you suffer from the flu, you experience muscle aches, irritability, and loss of appetite. This video explores whether these unpleasant symptoms are actually caused by the infection itself or by your body's own immune response.

The video examines the role of proteins called cytokines in the immune response. Rather than the infection directly causing your discomfort, these proteins are responsible for the systemic symptoms you experience, such as coughing and muscle aches, as your immune system fights back.

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