Autoimmune Polyglandular Syndrome (APS) is a group of rare disorders caused by autoimmune responses. These disorders involve multiple endocrine glands, including the thyroid, parathyroid, adrenal, and pancreas, and can lead to a wide range of symptoms. There are three types of APS, each with its own set of symptoms and characteristics.
Type 1 Autoimmune Polyglandular Syndrome (APS-1)
APS-1 is an inherited disorder caused by a mutation in the AIRE gene, which is responsible for regulating the immune system. Symptoms usually appear in childhood and include chronic mucocutaneous candidiasis, hypoparathyroidism, Addison's disease, and hypogonadism. Other symptoms may include diabetes mellitus, vitiligo, alopecia, and pernicious anemia.
Type 2 Autoimmune Polyglandular Syndrome (APS-2)
APS-2 is much less common than APS-1 and is not inherited. It is caused by an overactive immune system attacking the endocrine glands, leading to hypoparathyroidism, Addison's disease, and/or thyroiditis. Other symptoms may include diabetes mellitus, vitiligo, alopecia, and pernicious anemia.
Type 3 Autoimmune Polyglandular Syndrome (APS-3)
APS-3 is a rare form of the disorder that usually affects adults. It is caused by an overactive immune system attacking multiple endocrine glands, leading to hypoparathyroidism, Addison's disease, and/or thyroiditis. Other symptoms may include diabetes mellitus, vitiligo, alopecia, and pernicious anemia.