Right lower lung occupancy refers to the shadow of non-normal lung tissue in the lower lobe of the right lung found on clinical examination. It is mainly considered to be related to lymphoma, cyst, lung cancer, etc. It is recommended that patients follow the doctor’s instructions after clarifying the cause of the disease. 1. Lymphoma: when there is lymphoma in the lower lobe of the right lung, the examination can see occupancy of the right lower lung. The cause of lymphoma is not clear, which may be related to infection factors, genetic factors and so on. Typical symptoms of patients include localized lymph node enlargement, fever, night sweats, emaciation, etc. They can be treated by radiotherapy, chemotherapy, etc., and hematopoietic stem cell transplantation is feasible when necessary. 2. Cysts: when there are cysts in the right lower lung, it can be manifested as right lower lung occupation. Lung cysts may be related to congenital factors, genetic factors, etc. If the size is small, there is no obvious symptom, but if the size increases, there will be lung pain, shortness of breath and other symptoms. Usually, patients can be treated with sclerotherapy or cystectomy or cyst windowing surgery as prescribed by doctors. 3. Lung cancer: belongs to malignant tumors, the cause of which is still unclear and may be related to smoking, air pollution, exposure to ionizing radiation and so on. Lung cancer patients can be seen occupying the right lower lung, which is easy to be accompanied by cough, hemoptysis, dyspnea, chest pain and other uncomfortable symptoms. Lung cancer patients are recommended to cooperate with doctors for surgical treatment, and can also be combined with radiotherapy, chemotherapy and molecular targeted therapy. There are many causes of right lower lung occupancy, such as abscess, hemangioma, cellular adenoma, parasitic infection and so on. It is recommended that the patient undergoes further detailed examination in order to clarify the cause of the disease and then follow the doctor’s instructions for treatment.