if an illness or medical condition flares up, it becomes worse
same as flare
Although the flare-up was on B-floor of D-hall, the bells were audible all over the prison.
But the guards, alerted by the initial flare-up, were on their way.
He is never prepared for the power of his own fury, like the flare-up of a fever or hitting a wall at a hundred miles an hour.
In moments of stress, his asthma always flares up.
It looked as if the fighting might flare up again.
The fire could flare up again at any time.
flares up
flaring up
flared up
There is no origin for this phrasal verb
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