Under normal circumstances, there will not be hard lumps in the breast after pregnancy, after pregnancy by the influence of hormone levels, the mammary glands began to proliferate and become larger, if the mammary glands usually have the symptoms of cystic hyperplasia of the mammary glands, may lead to the overall proliferation of the mammary glands, the touch of the breast lumps and pain symptoms, considering that the hormone levels rise after pregnancy caused. If there is no pain or discomfort or other abnormalities, there is no need for treatment, and ultrasound is done when necessary. The hard lump in the breast is considered to be a symptom of mammary fibroadenoma, which is usually a relatively small tumor, and after pregnancy is affected by the hormone level, the mammary fibroadenoma will increase significantly, and the lump in the breast will also be palpable, and the only effective treatment is surgical excision. No matter which situation it belongs to, it is recommended to go to the hospital for ultrasound examination to confirm the diagnosis.