Your GP should be able to make a confident diagnosis of mastitis based on a physical examination and by asking you about your symptoms.

If your symptoms are particularly severe, or do not respond to treatment, your GP may take a small sample of your breast milk for further testing. These tests can often identify whether a bacterial infection has taken place, and identify the particular bacteria, which can help aid treatment.

As mastitis is usually due to problems with breastfeeding, your GP and/or your midwife may ask you to demonstrate your breastfeeding technique.

You should not feel that this means you are being tested or blamed. Breastfeeding is like anything else - it can take time, practice and sometimes advice to get it right.