4mm solid nodules generally do not need six months follow-up, one year follow-up can be, mainly to observe the specific nodule changes, most of them do not have too much problem. 4mm solid lung nodule is a large part of no problem, the clinical choice of review need not be too frequent, there is no need to half a year follow-up, the clinical requirements of about one year follow-up can be. Lung CT can be routinely reviewed every year to observe changes in the nodule. Most of the nodules that have not changed in two consecutive years are basically stable nodules and do not require special intervention. 4mm solid lung nodules, the review process appears to increase in size, need to consult a doctor in a timely manner, under the guidance of the clinician for examination, diagnosis of the condition after standardized treatment, to avoid delaying the condition.