05/13/2026
An autoimmune disease is a condition in which the immune system attacks the body instead of defending it. If you have an autoimmune disease, your immune system is more active than it should be, attacking self-antigens, cells, and/or organs.
Common autoimmune diseases include Rheumatoid Arthritis (RA), psoriasis, systemic lupus erythematosus (SLE), multiple sclerosis (MS), and type 1 diabetes.
Stanford Medicine scientists believe that the reason women experience more autoimmune disease than men is because of their double X chromosomes. Other researchers believe that the vast endocrinological (hormonal) changes that women experience in their lifetime may also play a role.