The pain in the lower arc of the breast is judged according to the location of the cause of pain, which can be roughly divided into physiological and pathological factors. Physiological factors mainly consider the pressure of underwear, while pathological factors mainly include local skin lesions, costochondritis, mammary gland hyperplasia and breast tumors. You need to go to the hospital in time, clear diagnosis and symptomatic treatment. One, physiological factors: too tight underwear and underwear with steel wire material may cause serious compression symptoms on the lower circle of the breast, after wearing a longer time may appear the lower circle of the breast arc pain, there will be obvious local indentation. The symptoms can be significantly relieved by replacing the well-fitting and comfortable underwear. Second, pathological factors: 1, local skin lesions: usually including local skin soft tissue infectious diseases and certain skin diseases, can also appear under the breast a circle arc pain symptoms. Infectious diseases local will be accompanied by obvious redness, swelling and pain, etc. Serious cases may form local abscesses. Anti-infective treatment with cefaclor and ofloxacin can be administered as prescribed by the doctor, which can effectively relieve the condition, and abscess formation may require abscess incision and drainage surgery. In addition, it may also be caused by certain skin diseases, such as herpes zoster, the patient’s local pain will be accompanied by small blisters and local skin redness, usually along the nerve distribution, the need to follow medical advice to use antiviral ointment, such as acyclovir ointment, etc.; 2, costochondritis: mainly manifested as pain in the chest area, can be manifested as a circle of arc pain under the breast, pain can be radiated to the back or abdomen, pressure can appear pain. You can take symptomatic aspirin, ibuprofen and other drugs for anti-inflammatory and analgesic purposes as prescribed by the doctor, and the pain can be treated with local closure by injecting lidocaine or procaine under aseptic operation when the pain is obvious. For those for whom non-surgical treatment is ineffective, surgical excision of the diseased rib cartilage can be performed; 3. Mammary gland hyperplasia: it may be related to endocrine disorders, and there will also be an arc of pain under the breast, and the pain pattern is generally closely related to the menstrual cycle, and the pain is more pronounced in patients before the menstrual cycle, and the symptoms will subside significantly after the menstrual cycle. Patients can make a clear diagnosis through clinical performance and ultrasound examination, and can take breast fetish elimination capsules, prolotherapy pills and other drugs as prescribed by the doctor, which can make the symptoms better relieved; 4, breast tumor: whether benign tumor or malignant tumor, if the volume of the tumor is large, local compression and invasion will appear pain, which can be manifested as a circle of pain under the breast. Patients need to undergo surgery according to the size and nature of the tumor. The result of intraoperative rapid pathological examination is the direct evidence to determine the nature of the tumor, and further treatment is needed according to the nature. Patients with malignant breast tumors often need to undergo modified radical breast cancer surgery and choose chemotherapy, radiotherapy, endocrine therapy, and molecular targeted therapy based on postoperative immunohistochemistry results.