Mastitis is a medical condition that involves inflammation of the breast tissue, usually caused by an infection. It most commonly affects women who are breastfeeding, but it can also occur in women who are not lactating and in men.
The symptoms of mastitis can include breast pain, swelling, redness, and warmth, as well as fever and flu-like symptoms such as chills and body aches. The affected breast may also feel hard and tender to the touch, and the nipple may be sore or cracked.

Mastitis can be caused by bacteria entering the breast tissue through a cracked or sore nipple, or through a milk duct. Women who do not breastfeed are also at risk of developing mastitis, particularly if they have a history of breast infections or surgery.

Treatment for mastitis usually involves a combination of antibiotics to clear the infection and pain relief to alleviate the discomfort. In addition, it is important to continue breastfeeding or pumping to help clear the milk ducts and prevent further blockages.

If you suspect that you have mastitis, it is important to seek medical attention promptly. Left untreated, mastitis can lead to complications such as an abscess, which may require surgical drainage.