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The condition having fresh red colored blood in stool is called hematochezia. Generally, the closer the bleeding site is to the anus, the blood will be a brighter red. This blood is coming from lower gastro intestinal tract. Its most common causes are: inflammatory bowel disease(ulcerative collitis,crohn's disease),hemorrhoids,anal fissures,diverticular bleeding,intestinal infection (such as bacterial enterocolitis),
As he has been referred for a Colonoscopy & has had a history of diarrhea for some time now so most probable cause of his symptoms is ulcerative collitis,crohn's disease.
He need following tests:
-Ultrasound of lower abdomen,
As he had an infection in his stomach,so antibiotics are the drug of choice to cure this.
There is nothing dangerous or serious here.
Exact diagnosis can only be made after physical examination..So I advice him to go ahead for the colonoscopy. so as to know the exact underlying cause & then treatment will be done accordingly.
Hope this helped.
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