Left atrial hypertrophy generally refers to the patient’s left atrial hypertrophy or left atrial dilatation, indicating that the patient’s heart has developed structural changes and there may be a significant decline or abnormality in cardiac function. Left atrial hypertrophy is detected by spectral echocardiography with a probe frequency of 2.0-4.0 MHz, with the subject lying on the left side, and 2D ultrasound diagnostic routine to detect the left atrial internal diameter, with three consecutive measurements, and the average value of the three measurements being greater than 35 millimeters, i.e. left atrial hypertrophy, and right atrial and right ventricular internal diameters are normal. Left atrial hypertrophy generally indicates that the patient may have cardiovascular diseases, such as hypertension, hypertrophic cardiomyopathy, etc. The patient should pay attention to improve the lifestyle in a timely manner and under the guidance of a professional physician for treatment.