Based on thyroid function tests, ultrasound findings, and endocrinology consultations, 11 patients (29.7%) were diagnosed with Hashimoto's thyroiditis, including 1 patient diagnosed with Sjögren's syndrome due to longstanding xerostomia, xerophthalmia, and positive anti‐nuclear antibodies, anti‐SSA antibodies, and anti‐Ro‐52 antibodies. The gene discussed is TRIM21; the disease is Hashimoto thyroiditis.