The cause of a hard but not painful breast needs to be analyzed separately from the pain. Breast lumps are mainly considered in five cases, namely dense breast; breast fibroadenoma; breast cystic or lobular hyperplasia; superficial mammary phlebitis, which is relatively rare; and normal phenomena at special times, such as self-examination during menstruation can be found in the breast with a hard nodule, which is actually a hyperplastic lobule. If breastfeeding can appear breast hard nodules, most often for the accumulation of milk. Once you find breast, breast hard nodules, do not be too nervous, it is recommended to seek the help of a specialist. Pain and hard lumps are not necessarily linked, pain or no pain does not represent the nature of the lump, the actual clinical found that many breast cancer patients are not accompanied by lump pain, so some patients may have a misunderstanding, pain that is good or no pain must be bad, there is no such a necessary link. It is recommended that we must correctly recognize breast cancer, do not feel that all the hard lumps are predictive of breast cancer, usually more self-check, find hard lumps do not be nervous, pain or no pain, to remember to go into the hospital in a timely manner to seek medical help.