Clavicle metastasis of breast cancer can show symptoms such as lump, swelling of upper limbs and enlarged lymph nodes. 1. Lump: generally speaking, if breast cancer occurs clavicle bone metastasis, lump can be touched on or below the clavicle, which is because breast cancer metastasizes to the clavicle and forms new foci, which leads to the symptom of localized lump. 2. Swelling of upper limbs: it is due to the increasing size of the mass that compresses the surrounding veins, leading to circulatory disorders, which in turn leads to the symptom of swelling of upper limbs. 3. Lymphatic swelling: it is mainly due to the fact that clavicle metastasis of breast cancer involves clavicle lymph nodes, which leads to the symptom of lymphatic swelling. Besides, clavicle metastasis of breast cancer can also cause pain, numbness of upper limbs, pathological fracture, etc. It is recommended that patients go to professional hospitals in time and under the guidance of doctors to carry out relevant medical examinations, such as imaging examination, histopathological examination, etc., to find out whether metastasis has occurred and actively cooperate with doctors in the treatment.