Nipples are itchy and painful. What is the cause?

Nipples some itching, accompanied by mild pain, first of all, consider long-term do not pay attention to breast hygiene, or do not pay attention to nipple protection, damage and other symptoms, leading to bacteria and other microorganisms invaded the breast, causing mastitis. Secondly, female menstruation, pregnancy, hormone levels and endocrine levels change, can also cause the phenomenon.