With the arrival of spring, the recovery of everything is also the season of high incidence of respiratory diseases. When the three diseases of 'expectoration and asthma' came, many people still stuck in the concept of 'old chronic bronchitis'. In fact, because these early symptoms are similar to those of chronic obstructive pulmonary disease (COPD), shortness of breath in COPD patients is often ignored and misdiagnosed. Many patients have very subtle symptoms in the early stage of the disease, almost without any symptoms. When they feel uncomfortable, they have developed to the middle and late stages. The global mortality rate of COPD has not declined for many years, and the situation in China is not optimistic.

　　The pain of patients with COPD is like cutting meat with a knife: they gasp when they move, like thousands of invisible hands gripping each bronchus. They cannot breathe in or out. It is extremely difficult to breathe every breath. There is also sticky sputum that can not be coughed out, and they often feel that life is worse than death. How should we deal with COPD? First, let's understand the grading of COPD.

　　The grading of COPD is as follows

　　Grade I: mild chronic obstructive pulmonary disease, characterized by mild airflow restriction. Usually, but not all of them have symptoms of chronic cough and expectoration. At this stage, patients may not even notice that their lung function is abnormal.

　　Grade II: moderate chronic obstructive pulmonary disease, characterized by aggravating airflow restriction and progression of dyspnea after activities. At this stage, patients usually begin to seek medical help because of their dyspnea or an acute attack.

　　Grade III: severe chronic obstructive pulmonary disease, characterized by further aggravating airflow restriction, exacerbating shortness of breath, and repeated acute attacks will affect the patient's quality of life

　　Grade IV: extremely severe chronic obstructive pulmonary disease, characterized by severe airflow restriction or chronic respiratory failure. At this stage, the quality of life is greatly affected, and the acute attack may threaten life.