TED-Ed: The surprising reason you feel awful when you're sick - Marco A. Sotomayor

The video explores the symptoms of the flu, questioning whether they are caused by the virus or the body's immune response. It explains how the immune system reacts to pathogens, leading to symptoms like fever and fatigue, which may aid in recovery. The video also discusses the emotional effects of illness and the role of cytokines. It concludes with a look at autoimmune diseases and the evolution of the immune system.

What new insight or understanding did you gain from this video?