Late pregnancy found hard lumps in the chest, there is no pre-pregnancy may be hormone level changes, mastitis, mammary fibroadenoma and so on caused by the patient should promptly seek medical attention. 1. Hormone level change: the hormone level of the body will change during pregnancy, there will be mammary gland hyperplasia, which can be manifested as localized hard lumps, and some of them may have pressure and pain, such people should pay attention to rest and moderate exercise. 2. Mastitis: late pregnancy found in the chest lumps may also be caused by mastitis, there will be local redness and swelling, generalized fever, pain and other symptoms, you can use penicillin, metronidazole and other drugs under the guidance of the doctor for treatment. 3. Breast fibroadenoma: a common benign breast disease, there will be hard lumps in the chest, can occur during pregnancy, can be removed through surgery. All of the above medications and treatments should be administered under a doctor’s supervision.