发作 (fā zuò): Have an attack / break out (Verb) — Meaning & Stroke Order

His heart disease suddenly had an attack and he needed to be sent to the hospital immediately.

If this virus breaks out on a large scale among the population, the consequences would be unimaginable.

When did your last migraine attack occur, and how long did it last?

Once this latent virus breaks out, it will deal a devastating blow to the system.

Don't worry, the doctor said his heart condition won't have an attack in the short term.

Despite the high pressure, there have been no signs of his old illness breaking out recently.

My old ailment flared up again last night, and the pain kept me awake almost all night.