Breast stinging during pregnancy can be a normal physiological phenomenon, but it can also be caused by acute mastitis. 1. Normal physiological phenomenon: after the success of pregnancy, the hormone level of women’s bodies appear obvious changes, will lead to breast enlargement, and accompanied by mild tingling, tingling is not too serious, and the nipple will be enlarged and darkened, with the increase in the duration of the pregnancy, it may be improved on its own, do not need to carry out special treatment. 2. Acute mastitis: After pregnancy, as the breasts gradually increase in size, often wearing tight underwear or not paying attention to the nipple area care, may induce acute mastitis, the inflammatory substances increase after the local stimulation, will cause breast stinging pain, may also be accompanied by a local skin temperature, fever, breast pressure and pain and other symptoms. If breast tenderness is more pronounced during pregnancy, it is recommended to consult a doctor to identify the specific cause of the problem and provide targeted treatment.