Nodular hyperdensity in the right upper lung is a technical term for lung imaging examination, which is usually caused by lung infection, tuberculosis, lung tumor, etc. 1. Lung infection: mostly due to bacterial or viral infections leading to inflammatory exudation, which accumulates in the lungs, CT shows nodular hyperdensity. Accompanied by cough, sputum and other symptoms, treatment with oral antibiotics such as cephalosporin, penicillin, etc., or antiviral such as acyclovir and other treatments. 2. Tuberculosis: due to Mycobacterium tuberculosis infection, the lesion involves the right upper lung, resulting in nodular high-density shadow, often accompanied by low-grade fever, fatigue, weight loss and other symptoms. The main treatment is oral anti-tuberculosis drugs, such as isoniazid, rifampicin and so on. 3. Lung tumor: after a large number of tumor cells proliferate and damage, ischemic necrosis leads to nodular hyperdensity in the right upper lung. Surgical treatment is the mainstay, with radiotherapy if necessary for malignant ones. If nodular hyperdensity of the right upper lung is shown, it is recommended to be admitted to the hospital in time to find out the cause of the disease and then treat it in order to prevent delaying the disease.