Additionally, massage has also been shown to increase the total yield of milk released from the breast. (milkontap.com)
However, improper use of a breast pump can damage the nipple, cause severe pain and issues with milk release. (breastmilk.com)
Stress, here, can temporarily halt the release of milk because adrenaline goes up when you're stressed and that inhibits oxytocin and therefore milk release. (motherscircle.net)