Interstitial pneumonia should be strictly speaking a kind of interstitial lung disease, interstitial lung disease includes more than 200 kinds of acute and chronic lung diseases, most of which the etiology is still unclear, and the known etiology may be caused by the following kinds of factors:1. Occupational or home environment factors, such as long-term inhalation of asbestos, dust, dust mites, etc.2. Drugs or therapeutic factors, such as iododine, methotrexate, radiotherapy, etc. 3. , knotted hoof tissue disease or vasculitis factors, such as systemic scleroderma, rheumatoid arthritis, polymyositis, dermatomyositis, desiccation syndrome, systemic lupus erythematosus, allergic granulomatous vasculitis, and so on. In addition long-term smoking, family history, pet ownership, and history of exposure are also relevant factors for interstitial lung disease. If there is a clear cause, appropriate measures and necessary treatment should be taken as early as possible to avoid further lung damage.