Breast nodules are sometimes large and sometimes small, this situation may belong to the reasonable error of color ultrasound, but it may also be caused by breast hyperplasia or inflammation of the breast. When the color ultrasound measures the size of the breast nodule, there may be some error in the measurement due to operation; or the size of the nodule may change to a certain extent due to the different angle of measurement each time. However, this error change is usually not very large. The changing size of breast nodules is considered to be possibly related to breast hyperplasia or breast inflammation. The severity of the breast hyperplasia or breast condition will also show up as a change in the size of the breast nodule. If the breast nodules appear to change in size during the ultrasound examination, you should consult a medical professional to clarify the cause of the disease and then carry out targeted treatment to avoid delaying your condition.