Chronic inflammation of the left lung can be seen in fungal infection, Mycobacterium tuberculosis infection or secondary mechanization and fibrosis after infection, which need to be treated differently according to different situations. 1. Fungal infection: according to different types of fungi, corresponding antifungal treatment should be given, commonly used drugs such as fluconazole, itraconazole and so on. 2. Mycobacterium tuberculosis infection: tuberculosis is also a common chronic inflammatory disease, and active tuberculosis requires active anti-tuberculosis treatment, commonly used drugs such as rifampicin and isoniazid. 3. Mechanization and fibrosis secondary to infection: generally not given special treatment, regular follow-up observation can be. Usually due to bacterial or viral infection, different causes, different treatment, need to correspond to the application of antibiotic drugs or antiviral drugs. If chronic inflammation of the left lung is found, immediate medical attention should be sought to find the cause of the disease and standardize the treatment. The use of medication should follow the doctor’s instructions strictly, and the medication can be stopped if there is any discomfort.