The hazards of COPD include respiratory failure, spontaneous pneumothorax, pulmonary heart disease and lung cancer. 1. Respiratory failure: COPD is prone to recurrent lung infections, which constantly destroys lung function. In severe COPD, respiratory failure is often induced by infections, surgeries, secretion retention, etc., and in severe cases, it is even fatal. 2. Spontaneous pneumothorax: COPD can lead to pulmonary pustules, emphysema, often causing spontaneous pneumothorax, the onset of the emergency, the patient appeared restless, sweating, cyanosis, etc., and need to be actively rescued. 3. Pulmonary heart disease: chronic obstructive pulmonary disease patients long-term hypoxia will lead to pulmonary vasoconstriction, vascular remodeling triggered by pulmonary hypertension, the development of pulmonary heart disease, right heart failure. 4. Lung cancer: chronic obstructive pulmonary disease (COPD) is one of the high-risk factors for lung cancer. Repeated infections and chronic inflammation are easy to induce cancer. Once diagnosed with COPD, you need to strictly follow the doctor’s instructions to avoid further deterioration of lung function.