In some instances, mastitis can become severe enough that an abscess forms (when the hollow area in breast tissue fills with pus). An abscess is often painful and requires medical attention, but is not deadly unless it goes untreated and spreads to other bodily tissues.
For those with mastitis that also have a breast abscess, surgical drainage, IV antibiotics, or a hospital stay may be needed to monitor your healing and prevent the abscess from getting worse.
Very rarely, mastitis can lead to sepsis which requires urgent hospitalization and IV antibiotics. Signs of sepsis from mastitis include vomiting, diarrhea, slurred speech, or extreme confusion.
To avoid an abscess or sepsis, talk to your doctor as soon as you develop signs or symptoms of mastitis to get the appropriate treatment early on and to prevent any complications.