An important advance in the study of the physiology of stress came with the discovery in the 1990s that stress triggers the release of which play a role in inflammation and fever.

Cytokines

Explanation:

Stress causes the release of cytokines. Cytokines are proteins. To fight infections cytonkines initiate a response to the immune system this causes inflammation.

Stress can also lead to an increase in a person's allergies. Basically when we are affected by stress our body thinks it is being attacked hence inflammation and the affects of fighting infection appear.

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