Sinus tachycardia is a sinus rhythm greater than 100 beats per minute and is a common cardiac arrhythmia. The presence of sinus tachycardia in physical examination may be caused by physiological factors or pathological factors, such as hyperthyroidism, anemia, fever, etc. I. Physiological factors: such as drinking too much coffee, staying up late, smoking, emotional stress, etc., all these cases can lead to sympathetic excitation, causing compensatory acceleration of the heart rhythm. Generally, no special treatment is needed to remove the causes, such as quitting smoking, avoiding late nights and mental tension, sinus tachycardia can be gradually relieved. Pathological factors: 1, hyperthyroidism: the thyroid gland is an important gland in the body, if the thyroid gland function is hyperactive, thyroxine increased, it will lead to the body’s metabolism accelerated. In order to meet the demand for oxygen consumption, the body will compensate for the accelerated heart rhythm, manifested as physical examination sinus tachycardia, the majority of patients do not have obvious symptoms, a few may appear palpitations. Treatment, you can choose drug therapy, such as propylthiouracil tablets, methimazole tablets, propranolol hydrochloride tablets, etc.; 2, anemia: If the patient is anemic, the body’s red blood cells are reduced, resulting in a decrease in oxygen-carrying function, resulting in insufficient oxygen supply to various organs and tissues of the body, the body’s blood volume is reduced, which will also make the heart muscle cells more sensitive to hypoxia, resulting in sinus tachycardia, in order to increase the heart’s output per beat, to ensure Sinus tachycardia may also occur during physical examinations to increase the heart’s blood supply per beat, to ensure the blood supply to the organs and to relieve the lack of oxygen supply to the organism. It is recommended to treat the primary disease, correct anemia and find the cause of anemia, such as iron deficiency anemia can be given iron supplementation treatment, clinically used drugs include iron dextran oral solution, ferrous lactate tablets, etc., anemia can choose blood transfusion treatment; 3, fever: in the case of fever, the patient’s body temperature rises, the body metabolic rate increases, will also lead to physical examination sinus tachycardia. At this time, the main cooling symptomatic treatment, such as wiping the patient’s forehead, elbows, palms and other parts with wet towels for physical cooling, but also under the guidance of the doctor oral ibuprofen suspension, acetaminophen tablets and other drugs to reduce fever treatment. In case of combined infection, antibiotics should be taken according to the results of drug sensitivity, commonly used drugs include cefixime dispersible tablets, amoxicillin capsules, etc.; 4, other: In addition to the above, heart failure, acute myocardial infarction, acute myocarditis and other disease conditions may also lead to sinus tachycardia during physical examination, for example, patients with acute myocarditis may have different degrees of fever during the disease, when patients For example, patients with acute myocarditis may have varying degrees of fever during the illness, which may be accompanied by sinus tachycardia. The main treatment is to treat the primary disease, such as the use of disodium adenosine triphosphate tablets and other drugs under the guidance of a doctor, and the symptoms of sinus tachycardia can gradually improve after the primary disease is relieved.