The severity of pulmonary fibrosis needs to be considered in conjunction with other symptoms to determine the severity of pulmonary fibrosis, not based on this point alone can make a conclusion. 1. Minor pulmonary fibrosis is mostly caused by lung injury, immune system diseases, bacterial infections, long-term smoking, etc. It is a structural abnormality caused by abnormal repair of normal alveolar tissue after it has been damaged. 2. If the patient has no obvious other symptoms such as coughing and sputum, it suggests that the condition is not very serious. If there is severe coughing and sputum, dyspnea after strenuous exercise, and symptoms of suffocation, the condition is considered to be serious. If diagnosed with a little pulmonary fibrosis, it is recommended to go to the hospital in time to improve the examination, and standardized treatment under the guidance of the doctor.