Infrequent Breastfeeding: Not emptying the breast regularly. Pressure on the Breast: Tight clothing or improper breastfeeding positions. Breast Engorgement: Excess milk buildup in the breast. Incomplete Emptying: Insufficient milk removal during feeds. Breast Trauma: Injury or pressure on the breast. Milk Oversupply: Excessive milk production. Blocked Nipple Pores: Milk duct openings becoming blocked. Stress or Fatigue: Weakened immune function.