The common causes of hard lumps in the breasts of women in labor are milk stagnation, mastitis, and breast hyperplasia, etc. The causes are different, and the treatment methods are also different. 1. Milk stagnation: The mother’s milk secretion is too much and the baby eats too little; the start of feeding time is delayed; the baby sucks incorrectly every time the breast can not be completely emptied when sucking and so on will cause milk stagnation, which will lead to the formation of hard lumps. At this time, you can apply hot compresses to the local breasts, use breast pumps to suck out the milk, etc., and patients with mild symptoms can usually get relief. In addition, you should also develop good habits, maintain a good mood, pay attention to the regularity of work and rest, wear a supportive bra, etc., for the alleviation of the symptoms have a certain degree of help. 2. Mastitis: Bacteria invade the breast tissue directly or indirectly, causing inflammatory lesions of the breast and thus forming a lump. If the infection is not diagnosed and treated early, it can develop into an abscess or septicemia of the breast. When there is redness, swelling, heat and pain, follow the doctor’s instructions for medication, the main drugs used include magnesium sulfate, penicillin and other drugs. Patients with breast abscess need to undergo abscess puncture and irrigation or incision and drainage. 3. Breast Hyperplasia: Typical symptoms of breast hyperplasia are breast pain and breast lumps, i.e. hyperplastic glands. When the symptoms of breast hyperplasia are not particularly obvious, there is no need for special treatment, and regular rechecking of breast ultrasound is sufficient. For those who are suspected to have lesions after examination, surgical treatment is feasible. If there are hard lumps in the breast after delivery, after the general treatment is ineffective, you should go to the regular hospital in time to avoid delaying the condition. The use of drugs should be under the guidance of a doctor.