I am a 17 yr old male an I had my appendix removed 4 months ago. I am very active which is why this is depressing. I have had black stools and very runny diarreah. And I have pains as well. But I'm not sure if I should have a colonoscopy because of the risk factors. But I also want to find out if I have Crohn's disease or possibly polyps. Any suggestions would be great!