Men also have mammary glands because the mammary gland is a normal anatomical structure and both men and women have the tissue, only that the mammary glands in men are smaller and can develop related diseases such as mastitis, breast hyperplasia, mammary fibroadenoma, and even breast cancer. If a man finds a lump on his breast and it grows rapidly, he needs to go to the hospital as soon as possible. Usually, he needs to check the color ultrasound, and if necessary, do a puncture biopsy or excisional biopsy of the lump to clarify the nature of the lump. If the pathology result is benign, there is no need to worry too much, and regular review can be done. If the result is malignant, radical resection of the tumor is needed, and chemotherapy, targeted drug therapy, endocrine therapy and traditional Chinese medicine therapy may be given according to the pathological result at a later stage.