hi, thank you for your query. It is possible to produce breast milk when not pregnant for several different reasons. The hormone responsible for milk production is called prolactin. It is produced by the pituitary gland in the brain. the common causes are- 1.medications such as metaclopromide 2.A rare cause of high prolactin levels is a benign growth in the pituitary gland that over-stimulates the prolactin releasing tissue 3.In older women, a condition called duct ectasia can cause a milky discharge from the nipple Earlier high dose estrogens and Bromocriptine was used to to suppress lactation. nowadays supportive measure are used. To relieve breast engorgement and pain you might: Wear a supportive bra Apply ice packs to your breasts Take over-the-counter pain relievers thank you, wishing you good health