Symptoms of left atrial enlargement are typical manifestations, accompanying symptoms or complicating symptoms, etc. 1. Typical manifestations: the incidence of left atrial enlargement is very high, and the symptoms after the onset of the disease are typical, resulting in chest tightness, palpitations and physical fatigue. In more serious cases, shortness of breath and other discomforts may also occur. When the patient undergoes physical examination, there may be symptoms of dilation of the heart border, change of heart sound, sometimes accompanied by heart murmur. 2. Accompanying symptoms: If the condition of patients with left atrial enlargement continues to develop, there may be accompanying manifestations on the basis of typical symptoms, such as mitral valve insufficiency, which is mainly manifested as palpitations and cough. When the disease worsens, it also produces exertional dyspnea, fatigue and weakness. 3. Complications: Heart failure is a complication caused by enlargement of the left atrium, and severe shortness of breath may occur during heart failure episodes. The patient will come up for air after activity and will not be able to lie flat at night. In more severe cases, there will be significant swelling of both lower limbs, and sometimes the health of the digestive tract will be affected. It is recommended to consult a doctor for relevant examinations in time, and according to the specific situation, under the guidance of the doctor, carry out symptomatic treatment.