泻肚子英语怎么讲

just say "i have a diarrhea" (di-a-ri-a)

Diarrhoea stomach

have/suffer from diarrhoea

i am carthartic.
not sure that's how you spell it though
the word that is the opposite of constipated..

Or, you may simply say, "I've got the runs".

you may simply say, "I've got the runs".