Why is MS more common in women?
Women get MS two to three times as often as men. This may be due to differences in hormones, exposure to environmental triggers or differences in the immune system. The immune system in women is different than in men because of changes associated with hormones and pregnancy. Women have other autoimmune diseases more often than men, such as lupus and rheumatoid arthritis. Which of these factors is the cause of MS or other autoimmune diseases is unknown.
