Small patchy hyperdense shadow in the right upper lung field is considered to be pneumonia, tuberculosis and lung cancer. 1. Pneumonia: It may be due to low resistance of the body that viruses and bacteria invade and cause inflammation in the lungs, which may lead to small patchy hyperdense shadow in the right upper lung field. 2. Tuberculosis: it is usually due to the infection of lung tissue by tuberculosis bacillus, which causes inflammation of lung tissue, and then exudation, cavities and other lesions, which may lead to small spot-like hyperdense shadow in the right upper lung field. 3. Lung cancer: it belongs to occupying lesions, which may be stimulated by environmental factors, smoking and other factors, and may lead to increased density of small patchy shadows in the right upper lung field, which is mainly manifested as coughing and dyspnea, and there may be no obvious symptoms in the early stage. The presence of right upper lung field small patchy hyperdense shadow, may also be other reasons, should be timely to the hospital, to exclude other lesions, and actively deal with. The above drugs need to be standardized use under the guidance of a doctor.