mas·​ti·​tis ma-ˈstī-təs How to pronounce mastitis (audio)
plural mastitides ma-ˈsti-tə-ˌdēz How to pronounce mastitis (audio)
: inflammation of the breast or udder usually caused by infection
mastitic adjective

Examples of mastitis in a Sentence

Recent Examples on the Web Breastfeeding moms can develop mastitis, an inflammation of breast tissue that often causes pain and swelling. Angie Leventis Lourgos, Chicago Tribune, 5 May 2024 The sick cows, said Petersen, who owns Sunrise Veterinary Service, tended to produce milk that didn’t look quite right, and had mastitis, an inflammation of the udders. Erika Edwards, NBC News, 26 Apr. 2024 On Amazon, one product intended to relieve breast pain from health issues such as mastitis was flagged as inappropriate because the packaging showed an illustration of a breast, according to Hirschhorn. Eva Rothenberg, CNN, 14 Apr. 2024 Our Testers Ashleigh, mother of two, had mastitis with her first baby and was very mindful of selecting a pumping bra that provided support without being constrictive. Katrina Cossey, Parents, 10 Apr. 2024 The bra aims to optimize breast health and prevent common issues like mastitis and clogged ducts. Hilary Tetenbaum, USA TODAY, 30 Jan. 2024 Ferguson also points out that ensuring that your nursing tank does not fit too snugly can be crucial because a constrictive fit could potentially affect your milk flow and lead to a complication like mastitis. Chaunie Brusie, Rn, Bsn, Parents, 19 Oct. 2023 For clogged ducts, swelling, or mastitis with pumping, Dr. Braden also recommends talking to your doctor about: Using ibuprofen to reduce pain and swelling Taking sunflower or soy lecithin supplements Avoiding massage. Chaunie Brusie, Rn, Parents, 12 Oct. 2023 With proper knowledge, nursing mothers can prevent mastitis and try non-medical treatments before turning to an antibiotic, according to the American Academy of Family Physicians. Theresa Sullivan Barger, Discover Magazine, 23 Nov. 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mastitis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Greek mastós "breast, nipple" (probably from a pre-Greek substratal language) + -itis, probably after French mastite

First Known Use

circa 1842, in the meaning defined above

Time Traveler
The first known use of mastitis was circa 1842

Dictionary Entries Near mastitis

Cite this Entry

“Mastitis.” Dictionary, Merriam-Webster, Accessed 29 May. 2024.

Medical Definition


mas·​ti·​tis ma-ˈstīt-əs How to pronounce mastitis (audio)
plural mastitides -ˈtit-ə-ˌdēz How to pronounce mastitis (audio)
: inflammation of the mammary gland or udder usually caused by infection

called also mammitis

see blue bag, bovine mastitis, garget, summer mastitis

More from Merriam-Webster on mastitis

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