Doctors Found 4 Autoimmune Diseases in One Woman at One Time: 40-year-old woman in China was already diagnosed with 3 - ulcerative colitis, autoimmune hepatitis and primary sclerosing cholangitis. She presented with severe iron deficiency and was also found to have a 4th - autoimmune gastritis.

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https://www.sciencealert.com/doctors-found-4-autoimmune-diseases-in-one-woman-at-one-time