What exactly does it mean when my nipples are itchy?

Various causes!: Nipple itching can have serious underlying causes. Therefore one should be evaluated by a physician. The history and physical should lead one to a cause and determines further work up or treatment. An example of a serious cause is paget's dz, a rare breast cancer form. Less serious are benign breast tumors, skin dz like atopic dermatitis, mechanical causes like "joggers nipple.".