How to Say "flare-up" in Spanish
The Spanish word for “flare-up” is “brote” — B2 level. This is a very common word in everyday Spanish.
English → SpanishB2
nounB2
a sudden reappearance of a medical condition

Examples
Hubo un brote de gripe en la escuela.
There was a flu outbreak at the school.
Las autoridades controlaron el brote rápidamente.
Authorities controlled the outbreak quickly.
El paciente sufrió un brote de su enfermedad crónica.
The patient suffered a flare-up of his chronic illness.
Using with 'De'
When talking about an outbreak, you almost always follow 'brote' with 'de' and the name of the problem (e.g., 'brote de violencia').
Brote vs. Epidemia
Mistake: “Hay una epidemia en mi casa.”
Correction: Hay un brote en mi casa. Use 'brote' for small, localized groups; 'epidemia' is for much larger areas like whole cities or countries.
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