i have blood in my stool just now, red blood with mucus. loose stool. last september i had passed out big bowl of blood, so i went to see a specialist and did a colonoscopy, doctor said no polyp, no ulcer, nothing, no heamorrhoid (external & internal) too.  but i can feel the swollen vein near my rectum.  may i know if i shoud visit the specialist and do a colonoscopy again?  Thank you.
Hi and welcome to Chat Doctor. Thank you for your quarry.Most bleeding through rectum is non complicated and in more than 95% the exact cause is never found.Even with colonoscopy. Because it is usually some angiodysplasia or polyp which bleeds for a minute and then stops. After that it is hard to find the exact position of bleeding, and isn't necessary because this is minor amount of blood(most patient panic because think this is some star bleeding). Also, most of such bleeding are found in anus and rectum which can be examined by digitorctal exam or photocopy. So there is no need to do colonoscopy again. It can be hemorrhoids which wasn't protruded on the first exam. You should do frequent follow-ups and everything would be just fine. Cancer is the last that should be on your mind, But if you are>55 you shut do colonoscopy every 7-10 years. Wish you good health.