The causes of nipple scabs during pregnancy are exuberant secretion of sebaceous glands during pregnancy, incomplete daily cleansing, small amount of lactation, suffering from nipple eczema, mastitis and other mammary gland diseases. 1. Due to the effect of hormones during pregnancy, the sebaceous glands secrete too much, easily causing nipple scabs. 2. Daily cleaning is not thorough, not good breast cleaning and care. 3. When the mammary glands are already well developed in late pregnancy, milk-like liquid will appear on the nipple, but the amount is particularly small and not easy to be found, and over time it will form a crust on the nipple. 4. Eczema of the nipple will also appear the symptom of itching of the nipple with scabs. 5. When pregnant women suffer from acute mastitis, acute breast cysts and other mammary gland diseases, nipple scabs will also appear. Nipple scabs during pregnancy are mostly physiological phenomena, if there is any other discomfort, it is recommended to consult a doctor in time.