This document discusses breast engorgement, infections, and mastitis during breastfeeding. It notes that engorgement and infections can cause pain, tenderness, and fever. Mastitis is caused by bacterial infections like Staphylococcus and Streptococcus and presents with localized swelling, redness, and pain in one breast quadrant. Treatment involves breast support, feeding or pumping, antibiotics if infected, and draining any abscesses that form.