What is mastitis?

Mastitis can affect one area or a wider part of the breast. It may be related to irritation, a blocked duct, bacteria entering through damaged skin, nipple piercing, or breastfeeding. Some people develop flu-like symptoms such as chills or tiredness. A breast abscess is a possible complication in which pus collects in the tissue. A breast lump or pain has many possible causes, so mastitis should be assessed from the full pattern rather than assumed from one symptom.

Arrange a healthcare assessment for new or persistent breast inflammation, especially if you have fever or the red area is expanding. A clinician may examine the breast and decide whether medicine, ultrasound, or drainage is appropriate. Keep the skin clean, avoid squeezing the breast, and use a suitable pain reliever if it is safe for you. [Breast Pain](/symptoms/breast-pain/) provides related symptom information.

Get prompt advice for a hot, red, swollen breast with fever, worsening tenderness, nipple discharge, or a new lump. Seek urgent help if you feel faint or confused, have trouble breathing, or develop severe weakness. If symptoms do not improve with the recommended plan, return for reassessment because an abscess or another cause may need attention.

What is causing the inflammation? Is there a lump or abscess? Should I have an ultrasound? Which symptoms mean I should seek help sooner?