Mild pulmonary fibrosis is not very serious and does not require treatment if it is caused by an infection, but if it is an autoimmune disease, it needs to be detected and diagnosed early and treated early. 1. Mild pulmonary fibrosis caused by infection, such as viral pneumonia, bacterial pneumonia, etc., due to the incomplete treatment at that time, will leave a slight pulmonary fibrosis. In this case, treatment is usually not needed, and the lesion is fixed and will not progress. 2. Mild pulmonary fibrosis due to autoimmune disease or other causes requires prompt treatment, with allopathic treatment to control the progression of the disease, as well as antifibrotic (pirfenidone) and antioxidant therapy (N-acetylcysteine). As autoimmune disease progresses, pulmonary fibrosis worsens and requires early detection and treatment. Patients are advised to seek early medical attention to clarify the cause of the disease and decide whether treatment is needed based on the cause under the guidance of a medical professional.