Our immune system has a dark side: It’s supposed to fight off invaders to keep us healthy. But sometimes it turns traitor and attacks our own cells and tissues. What are called autoimmune diseases can ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? A new study finds that proteasomes—structures that reside in all cells in the body ...

The appendix is an organ we tend not to think about until it acts up, causes illness and needs to be removed surgically.

Chronic stress affects the immune system and the brain. Researchers now show that a particular enzyme found in cells of the immune system enters the brain under stress. In mice, it causes them to ...

The immune system is the frontline protection against infection, continually searching for and destroying unknown pathogens.