Thyroid disease is associated with increased rates of cerebrovascular disease. Both hypothyroidism and hyperthyroidism produce changes in cardiac contractility, myocardial oxygen consumption, cardiac output, blood pressure and systemic vascular resistance.The aim of this work was to measure the IMT in patient with hypothyroidism and hyperthyroidism in comparison to normal subjects.History taking, clinical examination, anthropometric measurement, thyroid function tests and measurement of IMT were done to all subjects.The results showed that the IMT in patients with hypothyroidism is significantly increased than in control subjects, in patient with hyperthyroidism it is significantly decreased than in control subjects.So the conclusion of this work can be that patients with thyroid dysfunction have different IMT than the normal subjects.