Fast heartbeat, high blood pressure, slow heartbeat, low blood pressure may be caused by physiological factors, high blood pressure, thyroid function abnormalities and other reasons. 1. Physiological factors: A fast heartbeat and high blood pressure can occur when you are emotionally excited or during strenuous exercise. When slowly stabilized or rested, the heart rate will slow down and the blood pressure may decrease. 2. Hypertension: Patients with high blood pressure may experience an increase in blood pressure and a fast heartbeat at the same time. Excessive use of antihypertensive medications that slow the heart rate may cause a slow heartbeat and low blood pressure. 3. Abnormal thyroid function: If the thyroid gland is hyperactive, the typical symptoms of fast heartbeat and high blood pressure will occur. If hypothyroidism, the thyroid hormone secretion is seriously insufficient, which will affect the cardiovascular system to appear the phenomenon of low blood pressure, slow heartbeat. When the patient appears to have a fast heartbeat and high blood pressure and a slow heartbeat and low blood pressure, he should go to the regular hospital in time for examination, to clarify the cause of the disease, and then carry out targeted treatment.