The details are as follows: 1. Not serious: If the nodule is caused by breast enlargement, it is not serious, because it is a common disease, commonly found in middle-aged and older women. If the nodule is caused by breast fibroid, it is not serious, because it is a benign disease, part of the patients can be observed, another part of the patients can be surgically removed. 2, serious: If the nodule is caused by malignant tumor, it is very serious, you need to improve the relevant examination as soon as possible, radical resection of the tumor, and then with lymph node clearance, later may need to give chemotherapy, targeted drug therapy, endocrine drug therapy and so on. Endocrine drug therapy and so on, because if not actively treated, it will endanger life safety.