Small dots on the lungs are mostly seen in nodular lung disease. Lung nodules are classified into 3 conditions: ground glass nodules, partially solid nodules, and solid nodules. The size of the small dots must be clarified. If it is less than 5mm, it is mostly a benign nodule and 1 year follow-up is recommended; if the small nodule is between 0.6-0.8cm, 3 months follow-up is recommended; if the nodule is larger than 0.8cm, 1 month follow-up is recommended. If it is a growing nodule, we should be highly alert to whether it is an early lung cancer change. Small dots on the lung also need to further look at the site of its occurrence. If it is on the apical lung, apical segment of the lobe, or anterior segment, be alert to the possibility of early tuberculosis, and if there is a history of contact with tuberculosis patients, further high-resolution CT of the chest and T-cell testing of Mycobacterium tuberculosis are required. If the patient has a history of long-term smoking and long-term exposure to large amounts of dust, the possibility of silicosis cannot be ruled out either, and further high-resolution CT of the chest is needed for further clarification.