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
AstraZeneca — The pharma giant rose 3% after its experimental drug, tozorakimab, was found to meaningfully reduce flare-ups in cases of chronic obstructive pulmonary disease.
—
Davis Giangiulio, CNBC, 27 Mar. 2026
Firefighters stayed on scene overnight to monitor the burn area for any flare-ups.
—Katie Langford, Denver Post, 26 Mar. 2026
But that becomes problematic in conditions like psoriasis, for which the memory of a flare-up can make the tissue overly sensitive to environmental triggers such as stress, leading to chronic inflammation.
—Claire Cameron, Scientific American, 26 Mar. 2026
Rather, the flare-up is a result of an intensification of long-simmering, historical security concerns along the Durand Line.
—Rabia Akhtar, The Conversation, 20 Mar. 2026
See All Example Sentences for flare-up
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Davis Giangiulio, CNBC, 27 Mar. 2026
Firefighters stayed on scene overnight to monitor the burn area for any flare-ups.
—Katie Langford, Denver Post, 26 Mar. 2026
But that becomes problematic in conditions like psoriasis, for which the memory of a flare-up can make the tissue overly sensitive to environmental triggers such as stress, leading to chronic inflammation.
—Claire Cameron, Scientific American, 26 Mar. 2026
Rather, the flare-up is a result of an intensification of long-simmering, historical security concerns along the Durand Line.
—Rabia Akhtar, The Conversation, 20 Mar. 2026
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 30 Mar. 2026.
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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