Hyperthyroidism may cause high blood sugar and high blood pressure. If the condition worsens, it may lead to hyperthyroidism crisis, which is a more serious condition and requires control of blood pressure and blood sugar under the guidance of a doctor. Hyperthyroidism is a condition in which the thyroid gland produces too much thyroid hormone, causing excessive sweating and weight loss. Because of the effect of thyroid hormone on the heart muscle, it will increase the contraction capacity of the heart muscle, resulting in an increase in systolic blood pressure. At the same time, thyroid hormone is also an antagonist of insulin, which means that it inhibits the action of insulin, thus leading to an increase in blood glucose, which can cause hyperglycemia. If actively treated, it may lead to hyperthyroidism crisis, causing systemic metabolic disorders, affecting the nervous, digestive, circulatory and other systems, which may be life-threatening. It is recommended that patients actively cooperate with the treatment, and after the hyperthyroidism has improved significantly, the symptoms of hyperglycemia and hypertension will also improve.