Painful breast pressure during breastfeeding is usually caused by milk stagnation, or it may be caused by acute mastitis. All treatments should promote milk emptying and control infection if there is any. 1. Breast milk stagnation: Breast milk stagnation is usually related to factors such as lack of milk emptying and blockage of the milk ducts. If the milk stagnates in the milk ducts, it can lead to increased pressure in the milk ducts, which can lead to the symptom of soreness when the breast is pressed, the treatment should be to avoid milk stagnation, and allow the baby to suck on the breast or use a breast pump to suck out all the breast milk. 2. Acute mastitis: Acute mastitis can develop from the accumulation of milk, usually accompanied by staphylococcus aureus and other pathogenic bacteria, the treatment should use a breast pump to suck out the milk, and give anti-infection treatment. In addition, insufficient milk secretion, excessive emptiness of the breast, press the breast will also have pain, at the same time, lactation breast pain may also be related to breast hyperplasia, should be identified. If there are symptoms of pain when pressing on the breast during lactation, it is recommended to consult a doctor in time to find out the cause and take care of it.