Native speaker
In Emirati Arabic, “Diarrhea” is إسهال (is haal).
إسهال
Diarrhea
It's in the phrasebook under At the doctor, with 251 more like it.
tashanuj bil batin
wija'bil-idhin
barid
skhoona
wija'bil sadir
wija'raas
Source: DLIFLC Emirati Medical Language Survival Kit (2007). Credits and licences