Tiny 1-3mm nodules are more likely to be benign, and it is recommended to review the CT once every 3-6 months to see if there is any change in the nodule. If the nodule does not change much, it can be rechecked once in 6 months. However, it should be noted that if the patient has a family history of tumor, or if the patient has bad life habits such as long-term heavy smoking, then the observation time should be shortened so as not to delay the condition and miss the best time for treatment. In addition, the review time should also be determined by the overall assessment of factors such as the nature, size and number of nodules. In addition to focusing on the size of the nodules, it is also necessary to determine whether the nodules are benign or malignant, multiple nodules or single nodules according to the clinician. If the nodules are multiple benign nodules, there is no need to pay too much attention to them, on the contrary, it is necessary to shorten the review time and pay close attention to them. It is recommended that the patient communicate with the doctor after the consultation and examination, and the professional doctor will judge the review time according to the specific situation.