Left bundle branch block may be caused by coronary heart disease, hypertensive heart disease, aortic stenosis, etc. It can be treated by taking medication and installing a pacemaker at the clinic. 1. Coronary heart disease: It is a disease response caused by obstruction of coronary arteries, which may cause pain, colic and other symptoms, and can also lead to left bundle branch conduction block. Medications such as captopril tablets, metoprolol tartrate tablets, and resuvastatin calcium tablets can be used as prescribed by the doctor to control blood pressure, improve cardiac function, and prevent myocardial remodeling. 2. Hypertensive heart disease: it is caused by long-term improper control of blood pressure, which may cause symptoms such as vague pain and discomfort, and may also lead to left bundle branch conduction block. Amlodipine, Benadryl tablets, nifedipine controlled-release tablets, metoprolol succinate extended-release tablets and other medications should be used as prescribed by the doctor. 3. Aortic stenosis: it refers to the disease reaction caused by calcification of the aortic valve, which may cause symptoms such as fainting, dyspnea, and left bundle branch block. This kind of patients can be treated with pacemakers, which can stimulate local myocardial excitation by pulsed current, and then stimulate and contract the whole heart through intercellular conduction. If the phenomenon of left bundle branch block occurs, you can go to the hospital in time, and actively follow the doctor’s instructions for treatment, do not blindly use drugs.