Hyperthyroidism does have the potential to cause high blood pressure. The high level of thyroid hormones in the body of hyperthyroidism patients may lead to high metabolism, which may lead to a faster heart rate in the cardiovascular system, and in some patients, this may lead to an increase in heart beat volume, resulting in an increase in vascular pressure and a rise in systolic blood pressure. However, the systolic blood pressure level of hypertension caused by hyperthyroidism is usually not particularly high, but generally on the high side, and this high blood pressure can gradually return to normal as the condition of hyperthyroidism is controlled. If a patient with hyperthyroidism has a medium to high blood pressure level and a family history of hypertension, and the blood pressure level is still high after the hyperthyroidism is controlled and T3 and T4 are normal, it should be considered that the hypertension is not caused by hyperthyroidism, but the patient may have a family history of hypertension. Therefore, although hyperthyroidism can cause hypertension, it is important to differentiate it when it occurs. In the case of hyperthyroidism combined with hypertension, it is very important to control the hyperthyroidism. Treatment with oral antithyroid medication or iodine-131 is usually required under the guidance of a physician. In a few patients, surgery may be required to control the hyperthyroidism. When the patient’s T3 and T4 levels return to normal, the high blood pressure will also be controlled. In addition to active control of hyperthyroidism, some blood pressure lowering medications are also needed. Usually pay attention to reduce the intake of iodine-containing foods such as seaweed and nori in the diet. It is advisable to eat a light diet, reduce the intake of sodium, and do not eat processed foods that contain a lot of salt.