Poor R-wave rise can be caused by low ventricular voltage, myocarditis, hypertension, functional diseases, and sleep deprivation. 1. Low ventricular voltage: If there is a low voltage in the ventricle, it can lead to a poor rise of the R wave, especially in anterior myocardial infarction due to the formation of a conduction block in the area of injury, which leads to a poor rise. 2. Myocarditis: patients with myocarditis may also have poor R-wave rise, because myocardial injury occurs recently in patients with myocarditis, which may lead to this kind of ECG abnormality in the damaged area. 3. Other diseases: other pathologic problems, such as hypertension and pneumothorax, can also lead to the appearance of poor R-wave rise. 4. Physiological factors: such as the patient’s severe mental stress and lack of sleep can also lead to this problem. Clinical R wave rising bad, must be alert to the existence of anterior wall myocardial infarction, recommend timely consultation, specific diagnosis and treatment need to follow the doctor’s advice.