Breast itching after breast pumping may be due to an allergy to the material used in the breast pump, which should be purchased from a proper shop. In a few cases, itchiness can be caused by fungal infection of the breast due to contamination of the breast pump. It is also important to pay attention to the local hygiene of your breasts after breast pumping, pay more attention to rest and avoid eating spicy, stimulating and oily food.