Bleeding when you poop is extremely common and, in most cases, comes from a minor issue like hemorrhoids or a small tear in the skin around your anus. That said, the color of the blood, how much there is, and whether you have other symptoms all matter. Understanding what’s behind the bleeding helps you figure out whether it’s something you can manage at home or something that needs a closer look.
What Blood Color Tells You
The shade of blood you see is a useful clue about where the bleeding is coming from. Bright red blood on the toilet paper or in the bowl usually means the source is low in your digestive tract: the rectum, anus, or lower colon. This is the most common type people notice, and it’s often from hemorrhoids or a fissure.
Dark red or maroon blood suggests bleeding higher up in the colon or small intestine. Black, tarry-looking stools point to bleeding even farther upstream, often in the stomach. The blood turns dark because it’s been partially digested on its way through. If your stools look black and sticky, that’s worth a prompt call to your doctor even if the amount seems small.
Hemorrhoids: The Most Common Cause
Hemorrhoids are swollen veins in and around the anus, and they’re the number-one reason people see blood after a bowel movement. There are two types, and they behave differently.
Internal hemorrhoids sit inside the rectum where you can’t see or feel them. They rarely hurt, but they bleed. You might notice bright red streaks on the toilet paper, on the surface of your stool, or dripping into the bowl. The bleeding can look alarming, but internal hemorrhoids are almost never dangerous.
External hemorrhoids form under the skin around the outside of the anus. These can itch, ache (especially when sitting), and feel like hard, tender lumps. They bleed occasionally, usually when you wipe. If a blood clot forms inside one, the pain can become intense.
Straining during bowel movements, sitting on the toilet for long stretches, chronic constipation, and pregnancy all increase your risk. A warm sitz bath for about 15 minutes several times a day, particularly after a bowel movement, can ease pain and swelling. Gradually increasing fiber in your diet softens stools and reduces straining, though adding too much fiber too fast can cause gas and cramping.
Anal Fissures
An anal fissure is a small tear in the lining of the anus, usually caused by passing a large or hard stool. The hallmark symptom is a sharp, stinging pain during a bowel movement, sometimes followed by a burning sensation that lasts minutes to hours afterward. You’ll typically see a small amount of bright red blood on the toilet paper.
Most fissures heal on their own within a few days to a few weeks. Keeping stools soft with fiber, staying hydrated, and avoiding straining gives the tissue time to repair. A fissure that persists beyond eight weeks is considered chronic and may need treatment, which can take another six to twelve weeks to fully resolve. Chronic diarrhea, childbirth, and inflammatory bowel disease can also cause or contribute to fissures.
Inflammatory Bowel Disease
Ulcerative colitis and Crohn’s disease both fall under inflammatory bowel disease (IBD), and both can cause bleeding, though they do so in distinct ways.
Ulcerative colitis typically causes bloody diarrhea, lower abdominal cramps, a sudden urgent need to get to a bathroom, and the persistent feeling that you haven’t fully emptied your bowels. Because the inflammation starts in the rectum and stays in the colon, bleeding tends to be obvious and centered in the lower abdomen.
Crohn’s disease more often causes belly pain with nonbloody diarrhea and unintended weight loss, especially when the small intestine is involved. Bleeding can still happen, but it’s less of a defining feature compared to ulcerative colitis.
If you’re experiencing ongoing bloody diarrhea alongside cramping, urgency, or weight loss, those symptoms together point toward something beyond hemorrhoids and are worth investigating.
Diverticular Bleeding
Diverticula are small pouches that form in the wall of the colon, a condition called diverticulosis. Most people with diverticulosis never know they have it. But if a blood vessel inside one of those pouches gets injured, bleeding can be sudden and heavy. The episode is usually brief and stops on its own, but even a short burst can mean losing a significant amount of blood. Unlike hemorrhoids, diverticular bleeding is typically painless unless the pouch also becomes infected (diverticulitis), which brings lower abdominal pain, usually on the left side. Any episode of heavy, sudden rectal bleeding warrants medical attention regardless of whether it stops.
When Bleeding Could Signal Cancer
Colorectal cancer can cause rectal bleeding, and it’s the concern most people are really searching about. The important thing to know is that cancer-related bleeding often looks different from hemorrhoid bleeding in a few ways. Hemorrhoid bleeding is typically bright red and happens during or right after a bowel movement. Cancer-related bleeding can be dark or bright red and may show up at any time, not just when you’re on the toilet.
Other red flags that set colorectal cancer apart include a persistent change in bowel habits (new constipation, diarrhea, or narrower stools), a feeling that your bowel doesn’t empty completely, unexplained weight loss, ongoing fatigue, and abdominal pain. None of these symptoms alone confirms cancer, but a combination of them, especially in someone over 45, calls for evaluation. The U.S. Preventive Services Task Force recommends that all average-risk adults begin colorectal cancer screening at age 45 and continue through age 75.
The honest reality is that it’s difficult to tell the difference between hemorrhoid bleeding and something more serious based on symptoms alone. That’s why persistent or unexplained bleeding is worth getting checked, even if the most likely answer turns out to be benign.
What Happens at the Doctor’s Office
If you go in for rectal bleeding, the evaluation is straightforward and usually starts small. A digital rectal exam, where a gloved, lubricated finger checks for hemorrhoids, fissures, or lumps, is often the first step. An anoscopy uses a short, lighted tube to give a direct view of the anal canal and can identify hemorrhoids, fissures, polyps, or signs of inflammation. The procedure is quick and done in the office.
If the cause isn’t obvious or your symptoms suggest something higher in the colon, a sigmoidoscopy or colonoscopy provides a more complete picture. A colonoscopy can find polyps, areas of inflammation, diverticula, or tumors throughout the entire colon. For most people with minor, intermittent bright red bleeding and no other symptoms, a full colonoscopy isn’t the first step, but it becomes important when bleeding is persistent, unexplained, or accompanied by the warning signs described above.
Signs That Need Emergency Care
Most rectal bleeding is not an emergency. But heavy or continuous bleeding, or bleeding paired with severe abdominal pain, warrants a trip to the emergency room. Call 911 if you’re also experiencing rapid shallow breathing, dizziness or lightheadedness when standing, fainting, blurred vision, confusion, nausea, cold or clammy skin, or very low urine output. These are signs of significant blood loss, and they need immediate attention regardless of what’s causing the bleeding.