The two types of IBD, Crohn’s disease and ulcerative colitis, are autoimmune diseases. People who have one type of autoimmune disorder tend to have other types as well. Some examples of more common autoimmune conditions include rheumatoid arthritis, multiple sclerosis, lupus, and thyroid disease. Rheumatoid arthritis is the most common autoimmune disease that is associated with IBD, followed by multiple sclerosis.
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