A 4a nodule followed up for 5 years does not mean that it is fine, it only means that it was fine at that time, it cannot tell whether it will progress in the future, and it still needs to be followed up regularly. 4a nodule is a standard in ultrasound imaging to determine nodules in the thyroid and breast, which are categorized into thyroid 4a nodule and breast 4a nodule. If a patient has a 4a thyroid nodule, it is recommended to go to the hospital and undergo biopsy and puncture to investigate the pathology, and if there is a short-term increase in size or malignant pathology, it is recommended to undergo radical surgical resection. If the biopsy result is normal, there may be no special treatment, but still need to insist on regular review, so as not to deteriorate without timely detection. If the patient has 4a breast nodule, the chance of malignancy is around 20%~30%, and it is impossible to determine the time of deterioration of the nodule in the short term, so it is necessary to follow up for a long period of time, so as to find out the changes of the nodule in time, and then give the corresponding treatment plan, such as surgical excision in a timely manner. Patients are advised to follow up and maintain good communication with their doctors.