1
: a sudden outburst or intensification
a flare-up of hostilities
2
: a sudden bursting (as of a smoldering fire) into flame or light
a danger of flare-ups
3
: a sudden appearance or worsening of the symptoms of a disease or condition
an asthmatic flare-up
Examples of flare-up in a Sentence
took medication to prevent a flare-up of her asthma
there's no need for an angry flare-up, as we'll take care of the problem immediately
Recent Examples on the Web
The earlier flare-up had faded into the background.
—
Russell Shaw, The Atlantic, 11 July 2025
Gilmore said crews would remain at the scene overnight defending properties from potential flare-ups and bolstering containment lines.
—Los Angeles Times, 7 July 2025
Take Photos Because skin symptoms of autoimmune conditions can come and go, your best bet is to take photos of your skin at baseline, with an absence of symptoms, as well as during flare-ups, Chitalia says.
—Elizabeth Yuko, Flow Space, 7 July 2025
Leaner cuts also reduce fat drips and flame flare-ups, which can contribute to carcinogen formation.
—Kathleen Ferraro, Verywell Health, 3 July 2025
See All Example Sentences for flare-up
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Russell Shaw, The Atlantic, 11 July 2025
Gilmore said crews would remain at the scene overnight defending properties from potential flare-ups and bolstering containment lines.
—Los Angeles Times, 7 July 2025
Take Photos Because skin symptoms of autoimmune conditions can come and go, your best bet is to take photos of your skin at baseline, with an absence of symptoms, as well as during flare-ups, Chitalia says.
—Elizabeth Yuko, Flow Space, 7 July 2025
Leaner cuts also reduce fat drips and flame flare-ups, which can contribute to carcinogen formation.
—Kathleen Ferraro, Verywell Health, 3 July 2025
See All Example Sentences for flare-up
Cite this Entry
“Flare-up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flare-up. Accessed 18 Jul. 2025.
Copy CitationMedical Definition
flare-up
noun
: a sudden appearance or worsening of the symptoms of a disease or condition
an asthmatic flare-up
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