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
Synonyms
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 budding anti-migrant sentiment has led to occasional flare-ups of protest or violence and prompted the United Nations refugee agency to conduct its own poll of public views on migration in Mexico.
—
Lauren Villagran, USA TODAY, 2 Dec. 2024
Pointing out that canker sores are a common manifestation of Crohn’s disease, especially during a flare-up of symptoms, for example, helps empower patients to understand their experiences, Cohen-Mekelburg says.
—Sarah Klein, TIME, 2 Dec. 2024
The conflict never formally ended and the flare-up is the most significant since 2020, when Russia and Turkey reached a ceasefire in Idlib.
—Eyad Kourdi, CNN, 1 Dec. 2024
Eosinophils are responsible for approximately 30 percent of COPD flare-ups and half of asthma attacks.
—Yaakov Katz, Newsweek, 27 Nov. 2024
See all Example Sentences for flare-up 
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Lauren Villagran, USA TODAY, 2 Dec. 2024
Pointing out that canker sores are a common manifestation of Crohn’s disease, especially during a flare-up of symptoms, for example, helps empower patients to understand their experiences, Cohen-Mekelburg says.
—Sarah Klein, TIME, 2 Dec. 2024
The conflict never formally ended and the flare-up is the most significant since 2020, when Russia and Turkey reached a ceasefire in Idlib.
—Eyad Kourdi, CNN, 1 Dec. 2024
Eosinophils are responsible for approximately 30 percent of COPD flare-ups and half of asthma attacks.
—Yaakov Katz, Newsweek, 27 Nov. 2024
See all Example Sentences for flare-up
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Cite this Entry
“Flare-up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flare-up. Accessed 15 Dec. 2024.
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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