Two lumps on the top of the arm of breast cancer patients may be the manifestation of metastasis, but it is also seen in other conditions such as poor lymphatic return, localized lipoma, sebaceous cysts and so on. The appearance of two packets on the arm of breast cancer patients is likely to be formed by the metastasis of cancer cells through lymphatic tissues, at this time, the patients may have the uncomfortable symptoms such as low fever, fatigue, and the local lumps may continue to increase in size. If there are two packages on the arm of breast cancer patients, it may be caused by congestion and edema of local lymph nodes due to the obstruction of lymphatic fluid reflux after surgery, which may be slowly dissipated with proper rest or local hot compresses. Two bags on the arm of breast cancer patients may also be caused by local trauma and subcutaneous lipoma, sebaceous cysts and other reasons. If two bags appear on the arm of breast cancer patients, it is better to carry out local pathology biopsy and other auxiliary examinations in time to make a clear diagnosis. Once metastasis is found, it is necessary to follow the doctor’s instructions to operate as soon as possible and receive regular radiotherapy in order to stabilize the condition in time.