Abnormal thyroid function can lead to high blood pressure, mainly due to hyperthyroidism. Hyperthyroidism increases the secretion of thyroid hormones, resulting in increased heart rate and sympathetic excitation, which can lead to high blood pressure, mainly due to increased systolic blood pressure. For hypertension caused by hyperthyroidism, the main thing is to treat the primary disease. In some people, hyperthyroidism itself is combined with primary hypertension, in which case it should be treated at the same time to try to keep the blood pressure under control, as hyperthyroidism can promote the progression of hypertension. People with hypertension should also pay attention to regular checkups to prevent the increase of blood pressure due to hyperthyroidism and other causes. For patients with hypertension, it is generally important to control the blood pressure to at least 140/90 mmHg or less.