Conversation: The conversation between human and AI assistant.
[|Human|] I passed 4 brown/black fibrous things about 1/2 inch long in my stool. There isn t any blood. I did eat some blueberries yesterday, so I was wondering if that could be what they are. My father is 74 and is battling colon cancer so I am a little concerned.
[|AI|]  Hi, your age should be known to me. History of colon cancer in your father put u on high risk for the same. Black thing in your stools is a matter or concern, if u have not taken anything unusual in food. Get a fecal occult blood testing done. If it is positive u should undergo colonoscopy and upper GI endoscopy. If it is negative, u should have a screening sonography of abdomen and colonoscopy at an age of 50 years or as symptoms indicate.