Please do not start any medication without a proper medical evaluation. A breast lump that has changed from painless to painful requires urgent assessment by a doctor. While pain can sometimes be caused by benign issues like cysts, fibroadenomas, or infections, we must rule out serious conditions first. You will need a physical breast exam and likely imaging, such as a mammogram or ultrasound, to get an accurate diagnosis. For temporary pain relief, you can take over-the-counter pain relievers like ibuprofen or acetaminophen and apply a warm compress. Please schedule an appointment with a healthcare provider immediately.