Itchy nipples may be related to endocrine disorders, nipple inflammation, nipple eczema and other reasons. 1. Endocrine disorders: If the endocrine disorders are caused by staying up too late, being tired, consuming too much spicy and stimulating food, etc., the estrogen level will be too high or the ratio of estrogen and progesterone will be imbalanced, which will cause itching of the nipple. 2. Nipple inflammation: If the nipple comes into contact with objects carrying pathogenic bacteria, it will easily lead to nipple inflammation, thus causing nipple itching. 3. Nipple eczema: Moist skin, excessive cleaning or improper wearing of underwear can irritate the nipple skin, destroying the barrier ability of the nipple skin and forming nipple eczema, thus causing nipple itching. It is recommended to pay attention to breast hygiene and wear cotton underwear to reduce the stimulation of the breast.