Chronic obstructive pulmonary disease is divided into acute exacerbation phase and stable phase. The details are as follows: 1. Acute exacerbation phase: manifested as cough, coughing sputum, shortness of breath, chest tightness, dyspnea, etc., with increased sputum, which is purulent or mucopurulent, accompanied by fever, general malaise, abdominal distension, poor appetite and other symptoms, and some patients even show telescopic breathing and inability to lie down; 2. Stable phase: coughing and coughing sputum are lighter, without obvious symptoms of dyspnea, and some patients are asymptomatic, mostly occurring in middle-aged and elderly people.