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What is the immune system?

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The immune system is the body's defense system or protective network designed to fend off invasion by harmful substances, including bacteria, viruses, and harmful chemicals. It also acts as a surveillance system against the development of cancer.

From: Migraine and Headache Glossary WebMD Medical Reference

SOURCES: Mayo Clinic. National Institute of Neurological Disorders and Stroke.

Reviewed by Nayana Ambardekar on February 13, 2019

SOURCES: Mayo Clinic. National Institute of Neurological Disorders and Stroke.

Reviewed by Nayana Ambardekar on February 13, 2019

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What is lethargy?

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