There are four main possibilities for itching inside the breast, as follows: first, cystic hyperplasia of the breast, one of the common breast diseases in women, when the hyperplasia is not obvious can appear itchy discomfort in the breast, accompanied by breast swelling and pain. When the disease progresses further, it can be manifested as increased breast pain with hyperplastic nodule-like changes. Secondly, acute mastitis, which occurs in lactating women, is a common acute purulent infection of the breast, manifested by itchy skin and accompanied by the formation of fluctuating lumps in the breast. Third, breast eczema, allergic aseptic inflammation of the breast, clinical manifestations of breast itching, and the surface of the breast with symmetrical distribution of allergic rash. Fourth, dry syndrome, manifested as dry, cracked skin of the breast, and accompanied by flaking off and intense itching. When itchy inside the breast should go to a regular medical institution to clarify the cause of itching, so that the disease can be detected and treated early.