Normal blood pressure and fast heart rate can be seen in sympathetic nervous excitement, fever, anemia, hyperthyroidism, heart disease and so on. 1. Sympathetic excitation: patients usually have sympathetic excitation due to external stimuli or mental tension, which will lead to an increase in adrenaline secretion in the body, resulting in a faster heart rate, which is not a pathological change. 2. Fever: mostly seen in infectious diseases, elevated body temperature will promote the acceleration of the heart rate, most people and the degree of elevated body temperature is proportional to the degree of infection control, the body temperature will return to normal. 3. Anemia: it will lead to a relative lack of oxygen in the body, the body will compensate for the accelerated heart rate to meet the body’s needs. 4. Hyperthyroidism: the patient’s body has increased levels of thyroid hormones, metabolic rate increases, the patient can have a faster heart rate. 5. Diseases of the heart itself: can also lead to rapid heart rate, such as atrial fibrillation, supraventricular tachycardia, etc. Patients with heart failure can also experience rapid heart rate. The causes of rapid heart rate are complex, so it is important to find out the causes and give the correct treatment under the guidance of a physician.