ST segment changes can be seen in myocardial infarction, coronary heart disease, angina pectoris, etc. According to different diseases, the symptoms are different, such as myocardial infarction can be manifested as severe chest pain. 1. Myocardial infarction can be manifested as ST segment upward elevation change, which can be upward elevation of the arch back, and the symptom is mainly manifested as severe chest pain. The symptoms are mainly severe chest pain with pressing pain and a sense of dying, accompanied by chest tightness, palpitation, generalized sweating, etc. Shock may occur in severe cases. 2. Coronary heart disease can be asymptomatic in the early stage, only manifested as ST segment changes, and in severe cases, typical symptoms can occur, such as chest pain, chest pressure, shortness of breath, and in severe cases, fainting can occur. 3. ST segment changes can also occur during angina attack, and the symptoms are mainly discomfort in the precordial area, chest pressure pain, which can be radiated to the back. ST segment change is a kind of pathological change, once found should promptly seek medical treatment, standardized treatment under the guidance of the doctor.