Right lower lung nodule is a lesion in the right lower lung tissue, which shows a round-like shadow on imaging, and the diameter of the nodule is between 5 and 10 mm. Lung nodules are lung shadows that appear as round-like, increased density in the right lower lung on imaging, chest X-ray, and CT, and can be categorized as solid, subsolid, and ground glass based on the imaging presentation. There are many causes of pulmonary nodules, such as tuberculosis, inflammation, granulomatous lesions, fungal infection, lung cancer, etc., which need to be clarified as soon as possible and then treated accordingly. The detection of small nodules in the right lower lung requires prompt medical attention, evaluation and a treatment plan under the supervision of a physician.