Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Fiber is scientifically validated for supporting and potentially treating the symptom of blood in stool, particularly when the cause is related to hemorrhoids, anal fissures, or diverticular disease. Blood in stool may arise from straining during bowel movements or passing hard stools, which can damage the delicate blood vessels in the rectum or anus. Dietary fiber increases stool bulk and softens stool consistency, making it easier to pass and reducing the need for straining. Multiple randomized controlled trials and systematic reviews support the use of fiber supplementation (e.g., psyllium, wheat bran) for reducing the recurrence and severity of bleeding in hemorrhoidal disease and anal fissures by improving bowel regularity.

However, fiber does not address all causes of blood in stool—such as colorectal cancer, polyps, or inflammatory bowel disease—where medical evaluation and different interventions may be required. The American Society of Colon and Rectal Surgeons, among other expert bodies, recommends increased fiber intake as a first-line conservative measure for minor anorectal bleeding due to benign causes. Fiber supplementation is generally considered safe and effective in these contexts, though it is important for individuals with persistent or unexplained blood in stool to seek medical assessment to exclude serious underlying pathology.

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