Final answer:
Mastitis is the inflammation of the breast tissue, usually caused by an infection. It commonly occurs in breastfeeding women and is typically treated with antibiotics and addressing breastfeeding difficulties.
Step-by-step explanation:
The condition described, characterized by unilateral breast pain with tenderness, sudden onset of fever, chills, and body aches, is known as mastitis. Mastitis is the inflammation of the breast tissue, usually caused by an infection. It commonly occurs in breastfeeding women as bacteria can enter the breast through a cracked or sore nipple. Treatment typically involves antibiotics and relieving breastfeeding difficulties, such as improving latch and ensuring proper breast emptying.