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The immune system is your body's natural defense system. It helps fight infections.
Your immune system is made up of antibodies, white blood cells, lymph nodes and vessels, and other chemicals and proteins.
The parts of the immune system work together to protect your body. They attack and destroy substances that are foreign to your body, such as bacteria and viruses.
Immunity is how well you are protected from a disease. You may be born with short-term protection from certain diseases. Or you may be protected after you get an infection or a vaccine.
A vaccine helps your immune system make antibodies to fight a disease. Those antibodies will then fight the disease if you're exposed to it in the future. This helps keep you from getting sick. Or you may not get as sick.
Your immune system can cause:
You may be able to help your immune system by having a healthy lifestyle. Make sure to:
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Current as of: July 30, 2018
Author: Healthwise Staff
Medical Review:Adam Husney MD - Family Medicine & Elizabeth T. Russo MD - Internal Medicine
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