The immune system is the body's natural defense system that helps fight infections. An impaired immune system does not work properly and can't effectively protect a person against infection.
Some conditions and medicines weaken or impair the immune system. These may include:
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerPeter Shalit, MD, PhD - Internal Medicine
Current as ofSeptember 9, 2014
WebMD Medical Reference from Healthwise