Depending on the degree of severity of acute and chronic mitral valve insufficiency, symptoms such as dyspnea, pulmonary edema, and pulmonary bruising can be seen, and untimely treatment can lead to discomfort, heart failure, arrhythmia, and even death. 1. Acute mitral valve insufficiency: if only mild regurgitation, mild chest tightness, palpitations and other symptoms of exertional dyspnea after exertion; and severe regurgitation to lead to acute left heart failure, telangiectasia, and even cause acute pulmonary edema, coughing up pink frothy sputum, but also sweating, irritability, cyanosis, etc., and will lead to death if not treated in time. 2. Chronic mitral valve insufficiency: Mild regurgitation usually has no obvious symptoms; however, if the regurgitation is severe, there can be fatigue, drowsiness, reduced activity tolerance and other discomforts, affecting the quality of life. It also leads to pulmonary stasis, paroxysmal nocturnal dyspnea, cough, hemoptysis and other symptoms. It is prone to respiratory infections, heart failure, atrial fibrillation and other complications, which are serious and life-threatening. When mitral valve insufficiency occurs, it is necessary to improve the cardiac ultrasound and other examinations in a timely manner, and actively assess the severity of the disease and search for the cause of the disease, so that specialists can formulate a follow-up plan or treatment plan.