Tests and diagnosis

By Mayo Clinic Staff

Your doctor diagnoses mastitis based on a physical exam, taking into account signs and symptoms such as fever, chills and breast pain. Another clear sign is a wedge-shaped area of redness on the breast that points toward the nipple and is tender to the touch.

Your doctor will make sure you don't have a breast abscess — a complication that can occur when mastitis isn't treated promptly. A culture of your breast milk might help guide your doctor in determining the best antibiotic for you, especially if your infection is severe.

A rare form of breast cancer — inflammatory breast cancer — also can cause redness and swelling that could initially be confused with mastitis. Your doctor may recommend a diagnostic mammogram. If your signs and symptoms persist even after you complete a course of antibiotics, you may need a biopsy to make sure you don't have breast cancer.

June 12, 2015