Hidden pain in the heart when running may be a physiological reaction, if long-term, it should be considered as atherosclerosis of coronary arteries, hypertrophic cardiomyopathy, etc., according to the cause of the drug treatment or surgical treatment. 1. Physiological reaction: if you run too fast when running, there may be transient hypoxia, easy to cause transient chest tightness, generally no special treatment, regular observation can be. 2. Coronary atherosclerosis: when there is arterial coronary stenosis, it may cause myocardial hypoxia or ischemia, and the blood flow can not enter into the heart, and there may be hidden pain in the heart, i.e. angina pectoris. 3. Hypertrophic cardiomyopathy: when there is a narrowing of the left ventricular outflow tract, it may cause hidden pain in the heart, and may be accompanied by dizziness and palpitations. If the symptoms of hidden heart pain appear when running, it is recommended to pause the exercise and pay attention to rest, and then observe, if the symptoms do not go away, you should consult a doctor in time, according to the cause of the disease, symptomatic treatment.