All lung nodules in both lungs may be cancer, lung infection, tuberculosis, silicosis, pneumoconiosis and so on. 1. Infection: most of the double lung nodules are benign lesions due to inflammation, these patients usually have respiratory viral, bacterial or fungal infections before or during the filming, the nodule form is usually more rounded, with clear boundaries with the surrounding tissues, and the form is small, and the foci will be shrunken or disappeared after the use of anti-infective drugs. 2. Tuberculosis: Tuberculosis images are mostly corn-like nodules with uniform size, density and distribution, and may also show ground-glass-like shadow. 3. Silicosis and pneumoconiosis: Silicosis and pneumoconiosis are characterized by round or irregular shadows, and the size of lung nodules is not uniform. 4. Cancer: Cancer is mostly nodules of different sizes, and the larger nodules have burr-like changes, and the boundary with the surrounding lung tissue is not clear. Both lungs are full of lung nodules should immediately go to the hospital for diagnosis, under the guidance of the doctor for treatment, do not delay, so as not to cause the deterioration of the disease.