Autoimmune hypothyroidism and lupus-like syndrome.

The frequency of thyroid disorders, particularly Hashimoto's thyroiditis, may be increased in patients with connective tissue diseases. Both hypothyroidism and connective tissue diseases often cause muscle and joint aches, pains and stiffness. Skin, renal and cardiovascular involvement seen in the course of autoimmune hypothyroidism (AIH) may simulate connective tissue diseases such as systemic lupus erythematosus (SLE). We herein report a case of AIH who presented with massive proteinuria, haematuria, pleural fluid and arthritis simulating SLE.