Autoimmune thyroid disease in the form of hypothyroidism (Hashimoto’s thyroiditis) and hyperthyroidism (Graves’ disease) is most commonly associated with type 1 diabetes. Thus, it is important to periodically check thyroid stimulating hormone (TSH) levels.
Celiac disease, or gluten intolerance, is the next most common autoimmune disease associated with type 1 diabetes. Symptoms of the disease may be vague so clinicians must have a high suspicion to rule out the disease. Abdominal pain, growth failure, or menstrual irregularities are often associated with celiac disease; however, there may be no symptoms present.
Adrenal insufficiency, or Addison disease, may also be associated with type 1 diabetes and is extremely rare. Rheumatoid arthritis is another autoimmune condition that can be associated with type 1 diabetes, and can present with joint pain, redness or swelling.