Researchers studied 23 heart patients with pacemaker devices buried in their bodies, and most of these heart patients stopped using the drugs in question during the study. The researchers obtained electrocardiographic T-wave maps from the subjects that showed that the heart is greatly affected when the human brain is under stress. The degree of impact is even greater than the impact on the heart when doing overload exercise. In order to verify that anger or stress-induced irregular heart rate is a common phenomenon and not unique to heart patients, the researchers studied 17 healthy volunteers without heart disease. The results of the study also proved that when these healthy volunteers were stressed or angry, the heart T-wave graph, which reflects the heart rate, would show significant abnormalities. The researchers said that for a long time, human society has circulated such expressions as “death by anger,” suggesting that when a person is angry, it can cause the heart to work malfunction and die. However, their study is the first time with scientific data to prove that anger or tension can cause irregular heart rate or irregular heartbeat. The study data showed that the disturbance caused by mood tension can greatly reduce the number of heartbeats that should be. This suggests that a tense mood can affect the work of the nervous system, and a disturbed nervous system in turn affects the working state of the heart. Therefore, people should avoid putting themselves in a state of prolonged tension as much as possible to prevent their heart from developing more serious conditions due to long-term irregularities in heart rate. It is well known that arrhythmia is very dangerous, the arrhythmia can make the blood circulation abnormal, the more serious arrhythmia can lead to sinus arrest, sinus block and bradycardia, and in severe cases can lead to sudden death. Many arrhythmias do not have any symptoms. If symptoms are present, they usually include palpitations (an increase in heart rate that the patient can feel), slow heartbeat, irregular heartbeat, and pauses between heartbeats. Arrhythmias caused by severe disease are often accompanied by a number of symptoms, commonly dizziness, shortness of breath, excessive sweating, chest tightness, chest pain, pallor, chills in the extremities, convulsions, and coma. Mild arrhythmias can still work and study as usual.