The pain in the breast for more than 10 days depends on the situation. In the first case, if you are a breastfeeding woman or a new mother, it may be caused by mastitis and milk stagnation. In general, new mothers are not very experienced in breastfeeding, which may lead to milk discharge inside the breast is not very smooth, will form a milk stagnation, after the secondary bacterial infection may lead to inflammation of the breast. Therefore, the patient may experience pain in the breast, which is usually intense in nature and may be characterized by an increase in surface skin temperature or an increase in body temperature. If the diagnosis is clearly caused by inflammation of the breast, anti-infection treatment is usually needed, such as intravenous penicillin or cephalothin, etc., and the milk should be emptied so that the disease recovers faster. In the second case, it may be caused by breast enlargement, which is a benign lesion that generally has a higher incidence in women in their 40s. The pain in the breasts may be intense and pins and needles before the onset of menstruation, and may resolve on its own after menstruation. Ultrasound or mammogram can be performed to find out if there are any lumps or nodules inside the breast. If the diagnosis is clear that it is caused by breast enlargement, you will need to take oral medication for symptomatic treatment, such as prozac and breast disease, and oral painkillers, such as celecoxib and fenbuterol, when the pain is obvious.