I called in sick this morning because I have the stomach flu.
I have only been eating congee and bread for the past two days because of the stomach flu.如果是吃壞東西拉肚子，那就只會說 I ate something bad. (我吃了不潔的食物)
My son has the runs, and he’s vomited three times after dinner. I think he might have the stomach flu.