If the patient has mild to moderate mitral regurgitation there will be typical symptoms, for example, if the patient is acute mild or moderate mitral regurgitation, the patient will have exertional dyspnea, shortness of breath, shortness of breath, decreased exercise tolerance with wheezing, breath-holding and other clinical symptoms. Patients with moderate acute mitral regurgitation may experience symptoms similar to left heart failure, such as dyspnea, cough, sputum, even pink foamy sputum, and in severe cases, patients may experience clinical symptoms such as extreme respiratory distress. For mild and moderate mitral regurgitation, if the patient belongs to the chronic stage, the clinical symptoms may not appear typical symptoms, and only appear peripheral fatigue, fatigue, decreased activity tolerance and other clinical symptoms.