How to say diarrhea leave is better?

I suddenly have diarrhea, so I can't work/attend class normally. Please approve my leave.

1. symptom description: I suddenly have diarrhea today, accompanied by abdominal pain and discomfort. This makes me unable to concentrate on my work/class, and frequent going to the toilet affects the normal work/study process.

2. Demand for medical treatment: In view of the seriousness of symptoms and the aggravation of discomfort, I plan to go to the hospital for medical treatment so as to get the doctor's diagnosis and treatment advice in time. This will help me recover as soon as possible and return to normal state.