**3.3 Hashitoxicosis**

Hashitoxicosis, a term coined from Hashimoto's disease and thyrotoxicosis, is a rare condition seen in patients with autoimmune thyroid disease. Hashitoxicosis presents initially with clinical features of thyrotoxicosis and is associated with high radioiodine uptake similar to Graves' disease [24]. Later on it leads to development of hypothyroidism which is caused by lymphocytic infiltration and autoimmune destruction of thyroid gland similar to Hashimoto's thyroiditis. Anti-TSH receptor antibodies are found in nearly 23% of patients with hashitoxicosis [25].
