Most common cause of hypehyroidism-
Most common cause of hypehyroidism is Graves' disease - 76% followed by Toxic Multinodular goitre - 14% and Toxic Solitary thyroid adenoma - 5%. Reference : page 740 Davidson's Principles and practice of Medicine 22nd edition
Thyroid hyperplasia
Thyroid adenoma
Thyroid carcinoma
Grave disease
Endocrinology