Autoimmune diseases are the third most common cause of chronic diseases in the US, and despite how common they are, they’re widely misunderstood by the general public (1).
So what are these confusing conditions? Autoimmune diseases happen when your immune system attacks your own body.
Usually, the job of the immune system is to protect your body by sending cells to fight against invaders like viruses and bacteria. But when you have an autoimmune disease, your immune system confuses body parts like your joints, muscles, or skin for “invaders” and starts wreaking havoc on healthy cells. Certain autoimmune diseases only attack one part of the body, while others impact the entire body.
Women are about twice as likely as men to develop an autoimmune disease, and having one autoimmune disease increases your risk of getting another (2, 3).
If you have an autoimmune disease—or suspect you might have one—here’s a full list of autoimmune diseases out there, along with symptoms to look out for.