Hard lumps in the breast without pain are related to the patient’s age, gender and environment, mainly in the following cases: first, breast fibroids, which are benign breast tumors and do not cause pain per se, but only when the tumor increases and compresses the nerves. Second, breast lipoma, caused by the abnormal accumulation of fatty tissue, does not cause pain in itself. Third, breast cysts, which are formed due to changes in estrogen levels in the body, do not cause any pain in the early stage of the disease. Fourth, malignant tumors of the breast, no obvious symptoms in the early stage of the tumor, and hard tissue may be touched. Fifth, the normal development of the breast, due to the hormonal stimulation of the breast development in the body during youth development, the breast may have hard lumps. Sixth, the formation of scar tissue after the healing of trauma to the breast, mostly without pain, but hard lumps can be touched. Seventh, early breastfeeding milk stagnation, due to drainage of milk duct blockage, in the skin surface can be touched in the breast tissue hard lumps.