Autoimmune polyglandular syndrome type 3B: a key to diagnosing autoimmune gastritis and asymptomatic primary biliary cholangitis

Autoimmune thyroid disease in a patient should raise suspicion for autoimmune polyglandular syndrome type 3 (APS-3) and other potential autoimmune conditions.If APS-3 is diagnosed, further classification is recommended, along with a thorough search for additional autoimmune diseases.APS-3 serves as a framework for the differential diagnosis of autoimmune diseases.