Breast stinging like pins and needles during breastfeeding may be caused by acute mastitis, or it may be caused by spasm of the milk ducts, or it may be caused by mammary gland hyperplasia. 1. Acute mastitis: Acute mastitis is an acute purulent infection of the mammary gland, most often occurring in 3 to 4 weeks after childbirth is breastfeeding women, especially in the beginning of the mother, milk stagnation, nipple cracks and breakage and bacterial invasion is an important reason for the occurrence of acute mastitis, the patient of the disease can be found in breastfeeding breasts stinging pain, like pins and needles like symptoms. 2. Mammary duct spasm: Mammary duct spasm may be related to nipple breakage and poor breastfeeding habits and other factors, the disease also occurs in breastfeeding women, the patient may appear breast stinging pain, like pins and needles, this is due to the local vascular constriction. 3. Mammary hyperplasia: Mammary hyperplasia is a benign breast disease, breastfeeding patients with changes in hormone levels may trigger the disease, the patient may also appear breast tingling, like pins and needles like symptoms, the patient may also appear breast nodules, lumps, nipple discharge and other symptoms. In addition to the above diseases, breast trauma, breast tumors, etc. can also lead to breast tingling, like pins and needles symptoms, it is recommended to seek medical attention as soon as possible to identify the cause, so as not to delay the condition.