If the right lower lung patchy shadow is found in chest X-ray or chest CT, the following diseases should be considered: 1, lung infection can appear patchy shadow, patients usually have cough, sputum, fever and other symptoms, blood routine, sputum culture and other tests can be done; 2, pulmonary tuberculosis, right lower lung patchy shadow can be seen in pulmonary tuberculosis, combined with whether the patient has afternoon low fever, night sweats, wasting and other toxic symptoms of tuberculosis, and then further Patients with lung tumors can also have patchy shadows in the right lower lung, which need to be further diagnosed by bronchoscopy and sputum to find cancer cells. In conclusion, if patchy shadows are found in the right lower lung, patients need to do further examination to clarify.