The presence of left anterior branch conduction block is a very common cardiovascular lesion, and most patients do not experience significant discomfort, so it is not life-threatening. This condition is mainly due to conduction block caused by lesions affecting the left bundle branch of the heart, which itself is relatively long and thin. When the heart has coronary heart disease, hypertension, cardiomyopathy and other pathologies, the conduction function of the left bundle branch can be affected due to local ischemic injury. If an electrocardiogram reveals left bundle branch conduction block, it should be differentiated from acute anterior wall myocardial infarction by performing cardiac enzymes and other relevant tests such as cardiac ultrasound. In this case, it is necessary to have an examination to clarify the cause of the disease, and then to actively treat the cause.