Breast fibroids are benign tumors with a smooth surface and usually do not cause pain. However, if pain occurs, it may be secondary to other breast diseases such as mastitis, cystic breast hyperplasia and breast cancer. 1. Mastitis: The occurrence of this disease will lead to localized redness, swelling and pain in the mammary gland, accompanied by swollen lymph nodes in the armpit. Therefore, if breast fibroid pain is accompanied by redness and swelling, it may be a sign of mastitis. 2. Breast cystic hyperplasia: Breast fibroid pain may be caused by breast cystic hyperplasia, which usually occurs before menstruation, and the patient will experience breast swelling and pain, breast lumps and other symptoms. 3. Breast cancer: If breast fibrous tumor develops malignancy, then it is likely to develop into breast cancer. This will lead to the phenomenon of painful breast lumps, and in serious cases, it will even lead to the situation of nipple erosion. Therefore, patients should go to the hospital in time for examination to clarify the cause of the disease, and carry out targeted treatment under the guidance of the doctor, so as not to aggravate the condition. During the treatment period, patients should develop good living and eating habits, maintain a healthy routine, so as to promote the recovery of the disease.