Apart from mastitis, breast stinging pain during breastfeeding may also be caused by mastalgia, cystic hyperplasia of the breast, fibroadenoma of the breast, inflammatory breast cancer, etc. It is recommended to go to the hospital for further examination. 1. Mastalgia: It can be characterized by periodic breast swelling and pain, and a lump can be detected on palpation. 2. Cystic hyperplasia of the breast: its symptoms are similar to those of mastalgia, but there is usually no breast dysmorphism, which can be differentiated by pathological examination. 3. Breast fibroadenoma: the main symptom is breast lump, and some pathology can be accompanied by pain. 4. Inflammatory breast cancer: in addition to pain, it also manifests as localized skin redness, swelling, heat and enlarged lymph nodes. In addition, cardiothoracic diseases, herpes zoster, breast trauma and so on may also appear similar manifestations, and it is recommended to go to the hospital in time.