YOU SAID:
Why do i have diarrhea
INTO JAPANESE
下痢があるのはなぜですか
BACK INTO ENGLISH
Why is there diarrhea?
INTO JAPANESE
なぜ下痢がありますか?
BACK INTO ENGLISH
Why do you have diarrhea?
INTO JAPANESE
なぜ下痢をしているのですか?
BACK INTO ENGLISH
Why are you having diarrhea?
INTO JAPANESE
なぜあなたは下痢をしているのですか?
BACK INTO ENGLISH
Why are you having diarrhea?
That didn't even make that much sense in English.