A breast swelling and pain with hard lumps one is fine may be caused by breast hyperplasia, breast nodules, accumulation of breasts and other reasons. 1. Mammary hyperplasia: Mammary hyperplasia is caused by the abnormal expression of estrogen and progesterone in the body, and compensatory hyperplasia of the mammary glands occurs, especially in patients with a longer history of the disease, and also the formation of hyperplasia of the nodules, which will be manifested as a breast swelling and pain and hard lumps and a symptom that is fine. 2. Breast nodules: small hard lumps in the breast are called breast nodules, benign nodules have clear contours, can be moved, no adhesion to the skin, sometimes accompanied by breast swelling and pain. Malignant nodules are not clear in outline, not easy to move, adherent to the skin, no pain, but may be accompanied by nipple discharge or nipple inversion and other symptoms. 3. Accumulation of breast milk: a breast swelling and pain with hard lumps a fine may also be accumulation of breast milk, the main reason for accumulation of breast milk is that the milk does not pass, accumulate together. The main reason for this is the accumulation of milk, which is the accumulation of milk. If you have a painful breast with a hard lump, you should also consider other reasons such as tumor, trauma, inflammation, etc. It is recommended that you go to the hospital as soon as possible for a breast ultrasound examination to diagnose the cause of the disease, and then carry out the treatment. Daily life should also pay more attention to eating habits, try not to eat spicy stimulating food.