Your immune system may be weak if you have frequent, severe, or extended infections. Learn more signs of a weak immune system.

Add Yahoo as a preferred source to see more of our stories on Google. Doctors at the National Institutes of Health have discovered a new cause of skin cancer, according to a case report published ...

Some people have weak immune systems from birth due to genetic conditions called primary immunodeficiencies. Certain ...

Vitamin C, containing ascorbic acid, is an important water-soluble vitamin vital for many body functions. Low levels of vitamin C can cause symptoms such as a weakened immune system, fatigue, skin ...

Imagine your skin as a bustling city. Each cell is a hardworking citizen, repairing sun damage and keeping the peace. But lurking in the shadows is a virus long thought to be a harmless drifter: ...

At least since Susannah Calahan wrote the 2012 book Brain on Fire, there has been resurging speculation that psychosis might actually be a disorder of the immune system. Calahan eventually came to ...

An autoimmune condition that affects the thyroid gland, known as autoimmune hypothyroidism, is the most common autoimmune ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." We live in a time in which we have a vaccine, medication or other treatment strategy for almost any ...

That antibacterial soap by your sink might be creating more problems than it solves. While marketing messages have convinced many of us that eliminating germs is always beneficial, emerging research ...

Doctors at the National Institutes of Health have discovered a new cause of skin cancer, according to a case report published Wednesday in the New England Journal of Medicine. The culprit is a type of ...