Most of the breast tingling during pregnancy is caused by the change of hormone level in the body, especially the effect of progesterone, which stimulates the proliferation of breast ducts, the development of breast follicles and the increase of nipple sensitivity, which is a normal physiological phenomenon. You can change the size of your underwear according to the changes in your breasts and bust during pregnancy, with loose, comfortable, cotton fabrics to avoid pressure or friction stimulation on your breasts, and to support the protective effect. To keep your breasts clean, apply appropriate hot compresses to improve local blood circulation, and then apply a small amount of moisturizing lotion for pregnant women, or olive oil to keep them moisturized and prevent excessive dryness of the breast skin. If you already have breast-related diseases before pregnancy, and you have tingling symptoms in your breasts, and they persist without relief, you should go to the hospital in time to have a breast ultrasound to rule out the possibility caused by breast cysts, mastitis and other diseases.