Since interstitial lung diseases, with very diverse causes, are treated differently, so are the drugs used. For diseases caused by rheumatic connective tissue, commonly used include hormones, immunosuppressants, and drugs to treat the primary disease. The main point I want to talk to you about is idiopathic pulmonary fibrosis. There were no good drugs for this disease before, so there were only hormones, and the effect of hormones was uncertain, and the side effects of hormones were great. In these 5-10 years, the drug development is rapid and very fast. At present, the latest drugs for idiopathic pulmonary fibrosis, such as pirfenidone and nidanib, have been developed and applied in the clinic, and related patients can consider using drugs in this area.