The nipple pinching a little pain, consider the following conditions caused by: 1, may be due to inflammation of the nipple caused by pain, this situation is mostly due to the nipple duct is blocked by clothing fibers, as well as caused by bacterial infection, need to pay attention to hygiene. 2, if there is sexual life, and menstruation delayed more than 1 week, can be considered due to pregnancy caused by nipple pain, it is recommended to go to the hospital to check whether pregnancy. 3, may be due to The pain caused by menstrual flow, some women will have breast swelling and pain before the menstrual period, will come. The pain can be relieved after the menstrual period. 4, may be caused by breast enlargement, there will be hard lumps in the breast, pain and other symptoms. In addition, there may be pain caused by the baby biting the nipple during breastfeeding, it is best to go to the hospital for examination and treatment in time.