Left atrial hypertrophy may be caused by arrhythmia, aortic valve stenosis, mitral valve insufficiency and other reasons, the specific causes still need to go to the hospital to determine the examination. 1. Arrhythmia: Arrhythmia is usually caused by long-term emotional excitement, drinking a lot of alcohol, a lot of exercise, etc. If the patient has long-term atrial fibrillation, it will make the patient’s atrium beat faster, which will cause the left atrial hypertrophy, and the patient will also have symptoms such as fatigue, sweating, and dizziness. 2. Aortic valve stenosis: aortic valve stenosis is usually caused by congenital malformation, degenerative changes in old age, etc. Aortic valve stenosis will have a certain effect on the left ventricle, the patient’s left ventricular pressure load will increase, which will lead to left atrial hypertrophy, the patient will also have dyspnea, angina symptoms. 3. Mitral valve closure insufficiency: Mitral valve closure insufficiency is generally associated with infection, bad habits, trauma and other factors, when the patient’s left atrium contraction, the blood will be through the mitral valve reflux to the left atrium, will make the left atrium in a long-term capacity load increase state, thus left atrial hypertrophy will occur. If left atrial hypertrophy occurs, you should go to the hospital in time to do further examination to determine the specific cause, after diagnosis under the guidance of the doctor for treatment.