RESUMEN
A 47-year-old Filipino woman presented with goitre of 3 months' duration. She had no symptoms of thyrotoxicosis or hypothyroidism. Her thyroid was diffusely enlarged. Thyrotropin was elevated and free thyroxine was low. Ultrasound revealed slightly enlarged thyroid with diffuse parenchymal disease. Antithyroid peroxidase antibody was elevated. She was started on levothyroxine at 1.6 mcg/kg body weight/day and dose was adjusted to maintain the thyrotropin level within normal limits. Four years after the diagnosis of Hashimoto's thyroiditis was made, the patient started to experience malaise, generalised weakness and fatigue. Functional screening for other autoimmune endocrinopathy was done. Fasting 8 a.m serum cortisol was noted to be markedly decreased. She was diagnosed with autoimmune polyglandular syndrome type 2 (Schmidt syndrome). Physiologic dose of prednisone was started which afforded significant improvement in the patient's symptoms. The patient is on regular follow-up and clinically well.