I'm 17 years old male and I have to go to toilet...

Hello,
Thank you for your question.
our dear customer

What are the causes of diarrhea?

Viral infection
Bacterial and parasitic infection
Using illegal medication
Lactose intolerance
Inflammatory bowel diseases
Irritable bowel syndrome
Celiac disease

What are the symptoms of diarrhea?

Lose watery stool
Abdominal pain
Fever
Bloating
Blood in stool
Nausea
Vomiting

What are the complication of diarrhea?

Dehydration
Fatigue
Little urination
Dry mouth
Dry skin

What is the management of diarrhea?

Use antibiotics
use anti-parastic medications as flygel 
Drink fluids as much as you can to prevent dehydration
Treat any underlying medical condition
Healthy balanced diet contain all essential elements for your body
eat hot soaps , drink herbs 

How to diagnose diarrhea?

Blood test
Stool analysis
Colonoscopy
Feel free to message me anytime if you have any other questions.
Warm Regard
khaled jaber 

Dear customer 
You should follow the tips and advices provided above . ( Stool analysis and clinical assessment at the nearest medical center 
Stay well