A breast nodule of 5mm may not necessarily be early breast cancer, but may also be a simple breast cyst or benign breast tumor. Breast nodules include benign and malignant breast nodules. Benign breast nodules include breast cysts, breast fibroadenomas, lobular breast tumors and so on, while malignant breast nodules are breast cancers, which means breast nodules of 5mm may not necessarily be early-stage breast cancers, but may also be simple benign breast nodules. Breast nodule 5mm may also be early breast cancer, due to the early stage of the disease, in addition to the auxiliary examination found breast nodule generally have no other clinical manifestations, further examination, such as breast magnetic resonance imaging, breast tissue biopsy and so on to clarify the diagnosis. Patients who find breast nodule 5mm should not worry too much, they should actively cooperate with doctors to do the next examination to clarify the benign or malignant nature of the nodule, and actively cooperate with the treatment.