Graves Disease Following Subacute Thyroiditis in a Chinese Man

Area of Science:

• Endocrinology
• Immunology
• Genetics

Background:

• Graves disease (GD) following subacute thyroiditis (SAT) is an uncommon occurrence.
• Only 31 cases have been reported, with a notable rarity in males.

Observation:

• A 32-year-old man presented with symptoms consistent with SAT, including neck pain, fever, and elevated thyroid hormones.
• Following SAT resolution, he developed hyperthyroidism with elevated thyroid-stimulating immunoglobulin (TSI) and TSH receptor autoantibody (TRAb) levels, indicative of GD.
• Genetic testing revealed HLA-B35 and DRB1*15:01 alleles, known associations with thyroid disorders.

Findings:

• The case demonstrates the transition from SAT to GD, marked by the emergence of specific autoantibodies.
• Elevated TSI and TRAb levels confirmed the diagnosis of GD post-SAT.
• The presence of specific HLA alleles suggests a genetic predisposition.

Implications:

• This case underscores the importance of monitoring for recurrent hyperthyroidism after SAT, with TSI and TRAb testing crucial for diagnosis.
• The findings suggest that SAT may trigger thyroid autoimmunity in genetically susceptible individuals, leading to GD.
• Understanding the interplay between viral infections, genetic factors, and autoimmunity is key in managing thyroid disorders.