expression, godan verb (-ru)
have an asthma attack
Describes the onset of an asthma attack. The phrase is a fixed expression using 起こる (to occur).
彼は運動すると喘息が起こることがある。
He sometimes has an asthma attack when he exercises.
昨夜、急に喘息が起こって大変
Last night, I suddenly had an asthma attack and it was terrible.