<prompt> Most common cause of hypehyroidism-Thyroid hyperplasiaThyroid adenomaThyroid carcinomaGrave disease  <response>: Most common cause of hypehyroidism is Graves disease - 76 followed by Toxic Multinodular goitre - 14 and Toxic Solitary thyroid adenoma - 5. Reference : page 740 Davidsons Principles and practice of Medicine 22nd edition 