If the patient exhibits mitral regurgitation, this condition falls under cardiac valvular diseases. If the patient frequently experiences coughing and expectorating phlegm, it indicates a certain level of inflammatory infection. It is recommended for the patient to undergo a chest CT scan for an effective confirmation of the cause, which will then determine the treatment plan. For simple mitral stenosis, symptomatic treatment is currently the primary approach, using medications to address heart failure or ischemia and hypoxia. Early treatment is advised to alleviate the current state of ischemia and hypoxia. Persistent coughing and expectorating phlegm indicate inflammation, necessitating the use of antibiotics.