Pooping blood is not normal, but it is common. Roughly one in seven otherwise healthy adults report experiencing rectal bleeding at some point, and the vast majority of cases trace back to minor, treatable causes like hemorrhoids or small tears in the anal skin. That said, blood in your stool always deserves attention because it can occasionally signal something more serious, and the color, amount, and pattern of bleeding all offer clues about what’s going on.
What the Blood Looks Like Matters
The appearance of blood in or around your stool tells you a lot about where the bleeding is coming from. Bright red blood, whether on the toilet paper, dripping into the bowl, or coating the surface of your stool, typically originates from the lower digestive tract: the rectum, anus, or the last stretch of the colon. This is the most common type of rectal bleeding and the kind most often caused by hemorrhoids or fissures.
Dark, tarry, sticky stools with a distinctly foul smell point to bleeding higher up in the digestive system, usually the stomach or upper small intestine. Blood that travels through the full length of the gut gets digested along the way, turning it black. This type of bleeding is less common but generally more concerning and warrants prompt medical evaluation.
Maroon or dark red blood mixed into the stool often comes from somewhere in the middle, like the colon itself. Possible causes include small pouches in the colon wall that bleed (diverticulosis) or abnormal blood vessels in the intestinal lining.
Foods and Medications That Mimic Blood
Before you panic, consider what you’ve eaten or taken recently. Beets and foods with red coloring can make stools look reddish, convincingly mimicking blood. On the darker end, iron supplements, black licorice, blueberries, activated charcoal, and bismuth-based medications like Pepto-Bismol can all turn stools black. If your stool looks alarming but you feel fine and recently consumed any of these, that’s likely the explanation. The key difference: actual blood in stool tends to have a distinct smell, and true tarry stools are sticky in a way that food-related color changes aren’t.
The Most Common Culprits
Three conditions account for the vast majority of bright red rectal bleeding in otherwise healthy people: hemorrhoids, anal fissures, and constipation with hard stools.
Hemorrhoids are swollen veins around the anus or inside the rectum. They’re extremely common, and their hallmark is painless bright red blood, often noticed on toilet paper or dripping into the bowl after a bowel movement. You might also feel a soft lump near the anus or experience itching. Most hemorrhoids don’t hurt, which is actually how you can distinguish them from the other major cause.
Anal fissures are small tears in the skin lining the anal canal, usually caused by passing a large or hard stool. Unlike hemorrhoids, fissures tend to hurt, sometimes sharply, during and after a bowel movement. You may notice a burning or stinging sensation that lingers. The bleeding is typically small in volume but can be alarming to see.
Both conditions are closely tied to constipation, straining, and hard stools. Increasing fiber, drinking more water, and avoiding prolonged sitting on the toilet resolve most cases within a few weeks.
Less Common but More Serious Causes
While hemorrhoids and fissures explain most cases, rectal bleeding can also come from conditions that need medical treatment. Inflammatory bowel disease, which includes Crohn’s disease and ulcerative colitis, causes chronic inflammation in the digestive tract. Bleeding from IBD typically comes with other symptoms: persistent diarrhea, abdominal cramps, unintentional weight loss, fatigue, and sometimes fever. The bleeding pattern tends to be recurring rather than a one-time event.
Colon polyps, which are small growths on the inner lining of the colon, can bleed intermittently and often produce no other symptoms. Most polyps are harmless, but some can develop into colon cancer over time, which is why screening matters. The U.S. Preventive Services Task Force recommends colorectal cancer screening starting at age 45 for people at average risk. If you have a family history of colon cancer or IBD, screening may need to start earlier.
Other less common causes include diverticulosis (small pouches in the colon wall that can bleed, sometimes heavily, without pain), rectal ulcers, reduced blood flow to the colon, and infections that inflame the colon lining.
Patterns That Help You Gauge Severity
A single episode of a small amount of bright red blood after straining, especially if you’ve been constipated, is the classic low-risk scenario. It’s still worth mentioning to your doctor, but it rarely signals anything dangerous.
Certain patterns raise the stakes. Bleeding that recurs over several weeks, blood mixed into the stool rather than just on the surface, changes in bowel habits (new constipation or diarrhea lasting more than a couple of weeks), unexplained weight loss, or abdominal pain alongside the bleeding all warrant a medical visit sooner rather than later. Dark or tarry stools should always be evaluated promptly, since they suggest bleeding from higher in the digestive tract where the causes tend to be more serious.
Only about 14% of people who experience rectal bleeding actually visit a doctor about it. That’s a problem, because while most causes are minor, the serious ones are far more treatable when caught early.
What to Expect at the Doctor’s Office
If you go in for rectal bleeding, expect a conversation about your symptoms, diet, medications, family history, and bowel habits. A physical exam, often including a quick external and internal check of the anus and lower rectum, is standard.
Depending on your age, symptoms, and risk factors, your doctor may recommend a stool test to check for hidden blood, a flexible sigmoidoscopy (a short scope that examines the rectum and lower colon), or a full colonoscopy to view the entire large intestine. A colonoscopy is the most thorough option and allows the doctor to both find and sometimes treat the source of bleeding during the same procedure, for instance by removing a polyp.
Signs That Need Emergency Care
Most rectal bleeding doesn’t require an emergency room visit. But heavy or continuous bleeding, or bleeding paired with severe abdominal pain, calls for immediate care. If you notice any signs that suggest significant blood loss, you need emergency help right away. Those signs include rapid or shallow breathing, dizziness or lightheadedness when you stand up, fainting, confusion, blurred vision, cold or clammy skin, nausea, or producing very little urine. These indicate your body is struggling to compensate for the blood you’ve lost, and that’s a medical emergency regardless of where the bleeding is coming from.