If you are not breastfeeding, your breasts may feel painful or engorged when they are full with milk. Generally, relief from engorgement occurs in 24 to 48 hours. Until then, apply an ice pack such as a bag of frozen vegetables under your arms and along the sides of your breasts for 20 to 30 minutes several times a day. Do not apply heat or face the spray of hot water when taking a shower. Take acetaminophen or ibuprofen as directed. If there are areas on either breast that are red, hot, or tender, and you have a fever over 100.5 degrees Fahrenheit, call your doctor.