In patients with hypothyroidism, blood pressure is usually reduced to varying degrees. In hypothyroidism, the basal metabolic rate decreases, which is accompanied by a decrease in blood pressure, a decrease in pulse pressure difference, and a decrease in heart rate. Patients may also experience clinical symptoms and manifestations such as chest tightness, shortness of breath, precordial discomfort, peripheral weakness, sleepiness, and lethargy. The thyroid gland is a major endocrine, metabolic organ in hypofunction, and the neurohumoral-endocrine system will also be attenuated, and blood pressure adjustment will be impaired accordingly, so the need will be further reduced. In patients with hypothyroidism, there is also an increase in vagal tone, a consequent decrease in blood pressure, a corresponding slowing of the heart rate, and a corresponding decrease in myocardial contractility.