The causes of lumps in the armpit when the milk rises are mainly related to the blockage of the milk ducts within the paramedian breast and paramedian breast hyperplasia. When a woman is breastfeeding, if she does not breastfeed her child in time, it may cause the phenomenon of rising breasts to appear, not only will there be the symptom of hard lumps in the breasts, but it is likely to be due to the blockage of the breast ducts in the paratesticular breast in the armpits, which will result in the symptom of lumps in the armpits. The paratits are the extra breasts in addition to the normal breasts of the human body, mainly located in the armpits and armpits of the bulge, especially during breastfeeding and other special times, because of changes in the body’s sex hormones, resulting in paratits mammary gland hyperplasia and enlargement, the phenomenon of breast lumps in the armpits. If there are lumps in the armpits during breastfeeding, it may be due to enlarged lymph nodes, etc., and you can cooperate with your doctor for examination and treatment when this occurs. Normally, you should do a good job of hygiene and care to prevent infection.