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Understand and correctly interpret blood in your stool. Bright red, dark or tarry stool, hemorrhoids, colorectal cancer, warning signs, and when to go to the emergency room immediately.
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Emergency: heavy bleeding, circulatory symptoms (dizziness, racing heart), fever, severe abdominal pain — go to the ER immediately or call 112 (in the UK, 999 or 112)
Blood in the stool is a symptom, not a condition in its own right. The causes range from harmless hemorrhoids and anal fissures to inflammatory bowel disease, stomach ulcers, or colorectal cancer. What matters for interpreting it are the color, the amount, and any accompanying symptoms such as pain, fever, or weight loss.
A distinction is made between visible blood (bright red, dark red, or black) and occult blood — the latter is detectable only with a stool test (FOBT, iFOBT) and is part of colorectal cancer screening.
Important: even though the most common cause (hemorrhoids) is harmless, any first-time bleeding and any bleeding from age 45 to 50 onward should be evaluated by a doctor — even a small amount of blood can point to a polyp or an early tumor.
The color gives a first clue as to where the bleeding is likely located:
Usually comes from the lower digestive tract — rectum, anus, sigmoid colon. Most common causes: hemorrhoids, anal fissures, polyps, diverticula. Typical sign: blood on the toilet paper or streaks on the stool.
Suggests a bleeding source higher up in the large intestine — for example diverticula, tumors, or inflammatory bowel disease. The blood is usually mixed in with the stool.
Caused by blood from the upper digestive tract (stomach, duodenum, upper small intestine). Stomach acid breaks the blood down and turns it black. Tarry stool has a characteristic foul, sweetish smell. Always have it evaluated by a doctor — typical causes are stomach ulcers, esophageal tears, or, less commonly, tumors.
Detected only with a stool test (iFOBT) and can indicate polyps or early tumors — even when the stool looks normal. That is why regular colorectal cancer screening is so important.
By far the most common cause of bright red blood on the toilet paper. Hemorrhoids are enlarged vascular cushions in the anal canal — they can bleed, itch, or protrude during a bowel movement. Promoted by chronic constipation, a sedentary lifestyle, pregnancy, and heavy straining.
A small tear in the lining of the anus — typical signs are severe pain during and after a bowel movement, along with bright red blood on the paper. Often the result of hard stool or chronic constipation.
Pouches in the wall of the large intestine, especially in the sigmoid colon. They can bleed (usually painlessly, dark red) or become inflamed — then with fever and severe pain in the lower left abdomen. Common in people over 60.
Polyps are benign growths of the bowel lining that can, however, turn malignant. They usually bleed slightly and unnoticed — hence the occult blood. Colorectal cancer is one of the most common cancers and usually develops from such polyps over many years. Early signs: occult blood, changed bowel habits, weight loss, anemia.
Crohn's disease and ulcerative colitis often cause bloody diarrhea, mucus on the stool, abdominal pain, and weight loss. First onset is often in young adulthood (ages 20–40).
Bacterial intestinal infections (Campylobacter, Shigella, EHEC, Salmonella) can cause bloody diarrhea — typical after travel or contaminated food. See also diarrhea.
Ulcers of the stomach or duodenal lining can bleed — typically with tarry stool, sometimes also with vomiting of blood. Main causes: Helicobacter pylori infection and long-term use of NSAIDs (ibuprofen, diclofenac, acetylsalicylic acid/aspirin). More on this under heartburn.
Inflammation of the esophagus or tears in the lining after forceful vomiting can lead to bleeding — usually bright red blood when vomiting, and as melena in the stool.
Enlarged veins in the esophagus in advanced liver cirrhosis. A variceal bleed is a life-threatening emergency — always call 112 (in the UK, 999 or 112) immediately.
Stomach cancer, esophageal cancer, and, less commonly, small-intestine tumors can bleed — usually chronic and occult, with iron-deficiency anemia as the first sign.
See a doctor promptly (within a few days) for:
Colorectal cancer is one of the most common cancers — and one of the few that can be practically prevented through screening. Polyps grow into carcinomas over many years and can be removed directly during a colonoscopy.
Important: colonoscopy is the only examination in which polyps can not only be found but also removed on the spot. That makes it both a diagnostic and a treatment procedure at once.
The workup depends on age, course, and accompanying symptoms:
More on this under preparing for a doctor's appointment and understanding blood test results.
Mild hemorrhoids (grade 1–2): high-fiber diet, drinking enough fluids, stool regulation, topical creams/suppositories. Advanced (grade 3–4): rubber band ligation, sclerotherapy, or surgery.
Stool regulation (softer stool), warm sitz baths, creams with nitroglycerin or diltiazem to relax the sphincter muscle. Chronic fissures may need surgery.
Proton pump inhibitors (PPIs: pantoprazole, omeprazole), eradication of Helicobacter pylori (antibiotic combination), stopping NSAIDs where possible.
Step-up therapy by severity: mesalazine, corticosteroids, immunosuppressants (azathioprine), biologics (infliximab, adalimumab, vedolizumab) — specialist care from gastroenterology.
Polyps are removed directly during colonoscopy (polypectomy). Carcinomas require oncological treatment — surgery, chemotherapy, and possibly radiotherapy, depending on the stage.
Several drug classes can promote or directly trigger bleeding:
More: drug interactions, taking medication correctly.
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