Low precursors of cardiovascular diseases include dyspnea, chest tightness, chest pain, edema, palpitations, etc. Dyspnea with double lower limb edema, mostly seen in acute left heart failure, this time need to sit in a sitting position, leg drop, etc., timely to the hospital. Chest tightness, chest pain, if the duration of less than half an hour, angina pectoris may, can take fast-acting heart pills; if the duration of more than half an hour, for the possibility of myocardial infarction, in addition to symptomatic treatment, must immediately go to the hospital to prevent sudden death. Palpitations are mostly seen in arrhythmia, such as atrial pre-systole, ventricular pre-systole, a transient claim to observe, repeated episodes, and the frequency is very high, you need to improve the relevant examination, and find a professional doctor to guide the treatment. If there is relevant discomfort, it is recommended to consult a doctor immediately to avoid delaying the condition.