Premature ventricular contractions can be caused by cardiovascular stenosis, but they can also be caused by other factors such as medications and illnesses, and need to be determined based on a doctor’s diagnosis. Premature ventricular contractions refer to the sudden advancement of the ventricles in the course of their normal regular beating, which is clinically manifested by palpitations, chest tightness, and the feeling of a missed heartbeat or stoppage of the heartbeat. When patients have cardiovascular stenosis, such as coronary artery disease patients due to cardiovascular stenosis, resulting in insufficient blood supply to the heart, etc., it may cause premature ventricular contractions. In addition to cardiovascular stenosis causing premature ventricular contractions, there may be other factors, such as drug factors including drugs that act on the heart, such as antidepressants, anesthetics, cardiac drugs, etc., but also other non-cardiac diseases, such as hyperthyroidism, hypokalemia, etc.. Mental restlessness, excessive smoking, alcohol and coffee can also trigger premature ventricular contractions. It is important to note that if the patient has a premature ventricular contraction, he should go to the hospital in time to find out the cause of the disease, and actively treat it, so as not to delay the condition.