Chronic obstructive pulmonary disease, as its name suggests, is first and foremost a chronic disease, which is caused by long-term damage to the lungs, especially the trachea, by toxic and harmful gases from the outside world. It leads to stenosis of the trachea, it is difficult to inhale gas, and it is difficult to exhale the gas inhaled. In the case of lung disease, it means that it will eventually lead to emphysema, bullae, and decreased lung function, resulting in pulmonary symptoms such as asthma. Generally speaking, most of COPD is caused by smoking and other chronic factors. Some people have chronic bronchitis in childhood, which gradually develops when they grow up. In addition, some patients are caused by other lung diseases. These diseases include bronchial asthma, bronchiectasis and other diseases. Once formed, it is difficult to cure. The formation process of this disease is generally divided into three stages. The first stage is chronic bronchitis caused by smoking, and the second stage is chronic bronchitis caused by smoking. Stage 3 leads to emphysema and bullae. In stage 3, lung function is severely affected, which eventually leads to chronic obstructive pulmonary disease. Most of this disease occurs in people over the age of 40, especially if they smoke more than 20 cigarettes per day. People who have smoked for more than 20 years and patients under the age of 40 are very rare.
