I have extreme itching in the anal region (also in anus) and with frequent bowel movements i often get blood on the toilet paper. i went for colonoscopy, results showed no polyps or hemarroids.can the itching be due to diet?what can stop the itching?

Several causes: A normal colonoscopy is great, but if you have frequent bowel movements you could still have a parasite infection or something that would only be diagnosed by a specimen sent to the lab. Yeast infections or irritation from clothing or soaps could also cause itching. Try to use unscented, hypoallergenic soaps & detergents. You can try over the counter hydrocortisone cream & miconazole cream