Interstitial lung disease refers to a group of interstitial lung diseases, mainly caused by inflammation and pulmonary fibrosis, mainly due to fibrosis after damage to the interstitial lung, the main clinical manifestation of progressive aggravation of dyspnea, severe disease can continue to progress, and ultimately lead to respiratory failure, and even lead to death. Interstitial lung disease is a group of diseases, so its etiology is complex and varied, and the cause of some diseases is still unclear. Currently, the common causes are infection, environment, drugs, connective tissue diseases and so on. It can be caused by infections such as bacteria, mycoplasma, chlamydia, virus or pneumocystis; long-term exposure to the presence of a variety of dust or other harmful substances in the adverse environment, such as brass, lead and other metal dust, pine and other wood dust, etc.; the use of amiodarone, bleomycin, methotrexate and other medications, long-term radiation therapy or high-concentration oxygen therapy and so on. Progressively worsening dyspnea is the most common symptom of the disease, and the development of different types of interstitial lung lesions is different, both fast and slow. In addition, patients may have cough, fatigue, fever, night sweats, chest pain, rash, arthralgia, muscle pain, chills and malaise. It is recommended to consult a doctor for a clear diagnosis and treatment as prescribed by the doctor.