The hazards of breast massage mainly include causing soft tissue injury, mastitis and even accelerating tumor metastasis. 1. Soft tissue bruises. Massaging the breasts in an inappropriate frequency, strength and manner may directly damage the soft tissues related to the mammary glands, thus causing bruising and pain. 2. Induce mastitis. Soft tissue contusion may cause inflammation of the breast tissue and even induce breast cancer. 3. Accelerate tumor metastasis. For patients with breast malignant tumors, randomly massaging the breasts may accelerate blood and lymph circulation, thus accelerating the metastasis of cancer cells. It is recommended that those who have the need for breast massage be evaluated by a professional physician before performing the relevant operation, so as to avoid unnecessary injuries caused by improper operation.