The  infection of the breast tissue is called as mastitis. If you're breastfeeding, it's called lactation or puerperal mastitis. If you're not, it's called periductal mastitis. Mastitis can make you feel like you have the flu, but it can be cured a lot quicker.

Etilogy: Possible causes are a blocked milk duct or bacteria entering the breast. It usually occurs within the first three months of breast-feeding.

Symptoms :include breast pain, swelling, warmth, fever and chills. If you catch the symptoms early, you can stop them from developing into full-blown mastitis by applying warm compresses, massaging the lump (toward your nipple), resting in bed, and nursing and pumping as much as possible on the affected breast.  

The solution is prescription antibiotics. The drugs take effect swiftly. You'll feel better within hours, and the infection will be resolved within 48 hours-but keep taking the drugs for the prescribed period, and try to get as much bed rest as possible for at least a couple of days after your symptoms are gone

Ibuprofen will help reduce swelling and fever.

Continue breastfeeding while you're under treatment. The often you nurse, the more quickly you'll clear any plugged ducts. Try varying the nursing position to make sure all the ducts are fully drained. It may (probably will) hurt, especially at first, but this is the best way to deal with mastitis.

Untreated, mastitis can get much worse. It can develop into a breast abscess-a nasty situation that's more complicated to treat, often requiring minor surgery

Prevention

Tight bras and clothing put pressure on your breasts. Keep things light and loose.

To keep milk from backing up, make sure your baby attaches correctly, and get all the milk out of each breast during every feeding. A lactation consultant can help if you need support