Usually, if the size of the old lung nodule is less than 5 millimeters, it should be reviewed about once a year; if the size of the old lung nodule is about 5-8 millimeters, it can be reviewed once every six months; if the old lung nodule is larger than 8 millimeters, it can be reviewed once every three months. However, if patients experience more serious discomfort due to old lung nodules, they should go to the hospital immediately for review to prevent the condition from worsening. Old lung nodules are usually formed after a previous lung infection, and are mostly benign lesions that are less likely to cause discomfort, but may be at risk of deterioration. If the patient does not have any obvious symptoms, he or she can undergo regular checkups and use imaging methods to dynamically observe the size and density of the lung nodules. If the patient has pain, cough and other adverse reactions due to old lung nodules, he or she should go to the hospital for a timely review to clarify the status of the lung nodules, and contact the doctor as soon as possible to carry out targeted treatment if an increase in the size of the lung nodules and an increase in the density of the lung nodules are detected. If patients have old lung nodules, they should follow the doctor’s instructions to do regular review, timely understanding of the growth dynamics of the lung nodules, if the review found that the lung nodules appeared to have a large morphological changes, they should improve the examination as soon as possible, to make a clear diagnosis, and cooperate with the physician to complete the targeted treatment.