Lung micronodule nodule shrinkage is generally a good phenomenon, this kind of lung micronodule may be caused by pneumonia, tuberculosis, lung cancer nodule with infection. 1. Pneumonia nodules: mainly due to patients’ lung infection caused by bacteria, mycoplasma and other lung nodules, after anti-infective treatment, the clinic usually choose cephalosporins, penicillins for anti-infective treatment, after the treatment of lung inflammation absorbed, or even completely disappeared, and the lung nodules are also eliminated. 2. Tuberculosis nodule: mainly caused by Mycobacterium tuberculosis infection, after applying anti-tuberculosis drugs, such as rifampicin, isoniazid, pyrazinamide, etc., the tuberculosis nodule will gradually subside, and the nodule will show shrinkage. 3. Lung cancerous nodule with infection: patients with lung cancerous nodule, due to the infection of tissues around the lung cancer, after using antibiotic anti-infection treatment, the nodule will also be controlled. Patients with lung cancer need early surgical resection. Patients should go to the hospital in time if they have any discomfort, and should not be careless so as not to delay the treatment.