Your immune system is a vast network of organs, white blood cells, proteins, and chemicals. All of these components work together to protect you from germs and other invaders. Your immune system also helps your body recover from infections and injuries.

On the other hand, your immune system can react too strongly to invaders (real or perceived). It may mount an attack when there is no invader. Or it may continue attacking after the invader has been eliminated. An overactive immune system can lead to problems such as autoimmune diseases or allergic reactions.

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