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
Over the next week, firefighters will conduct daily inspections along the fire's perimeter to ensure no hot spots remain and to address any flare-ups that may occur.
—
Ca Wildfire Bot, Sacbee.com, 18 June 2025
To prevent clogged pores and blemish flare-ups while traveling this season, be sure to add a gentle yet effective facial cleanser to your toiletry bag.
—Amelia McBride, Travel + Leisure, 14 June 2025
While beverages containing the substance can trigger rosacea flare-ups, topical caffeine helps instantly fade redness for a more even-toned complexion.
—Conçetta Ciarlo, Vogue, 13 June 2025
But for many women dealing with stubborn midlife flare-ups, this new medicine represents a meaningful step toward clearer, calmer skin—not to mention, a bit more confidence.
—Lauryn Higgins, Flow Space, 12 June 2025
See All Example Sentences for flare-up
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Ca Wildfire Bot, Sacbee.com, 18 June 2025
To prevent clogged pores and blemish flare-ups while traveling this season, be sure to add a gentle yet effective facial cleanser to your toiletry bag.
—Amelia McBride, Travel + Leisure, 14 June 2025
While beverages containing the substance can trigger rosacea flare-ups, topical caffeine helps instantly fade redness for a more even-toned complexion.
—Conçetta Ciarlo, Vogue, 13 June 2025
But for many women dealing with stubborn midlife flare-ups, this new medicine represents a meaningful step toward clearer, calmer skin—not to mention, a bit more confidence.
—Lauryn Higgins, Flow Space, 12 June 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 1 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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