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The human body has hundreds of lymph nodes, one part of the immune system that helps defend the body against health threats. They aren't usually noticeable, but they are always working to deal with potential health problems.

The thymus gland is very important in the development of the immune system during fetal growth, infancy, and early childhood. As we grow into adulthood the thymus shrinks, but growing evidence suggests the gland may play a role in adult health for much longer than previously thought.

Removing tonsils in childhood was once routine care for healthy children, but is no longer recommended. Why are some organs and glands — appendix, tonsils, adenoids and more — considered expendable and why do we have them if they're not needed?

Ads for products that promise to supercharge the body's immune system make claims that sound too good to be true. But do these products actually work? 

News coverage of a case of leprosy in central Florida may have made it seem like there is an increased threat the disease would spread. Misconceptions about this disease have persisted for a long time, but the facts are reassuring.

Not only is our face our calling card to the world, its features evolved to mount immune system defenses, help ward off illness, and protect us in many ways. Our eyes, nose, mouth, and facial structure itself all contribute to our continued well-being.

One reason people eat yogurt is because it contains probiotics — beneficial bacteria and yeasts that improve digestion, provide protection from dangerous organisms, and boost the immune system. But not everyone likes the taste or texture of yogurt, so here are some other foods that offer the same benefits.

Irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) are different, though they can have similar symptoms. IBS symptoms seem to arise from hypersensitive nerves and abnormal muscle contractions in the digestive tract, while IBD results from a problem with the immune system causing inflammation.