Red-colored stool usually comes from something you ate, not from bleeding. Beets, red gelatin, fruit punch, red licorice, and red-dyed snack foods can all turn your poop a shade of red that looks alarming but is completely harmless. If you haven’t eaten any of these recently, though, the color could signal blood in your stool, and the shade, amount, and location of the red all help determine whether it’s a minor issue or something that needs attention.
Foods and Medications That Turn Stool Red
Before assuming the worst, think back over what you’ve eaten in the past day or two. Beets are the most well-known culprit, and they can produce a surprisingly convincing red color in both stool and urine. Red-colored gelatin, Kool-Aid, fruit punch, red licorice, and spicy red-dyed snack foods (like “red hot” chips) can all do the same thing. Certain antibiotics can also change stool color, though in some cases antibiotics cause actual bleeding rather than just a color shift.
If a food or drink is the cause, the red color will disappear within a day or two once you stop eating it. No treatment is needed.
What Blood in Stool Looks Like
If the red color isn’t from food, you’re likely seeing blood, and its appearance tells you something useful about where it’s coming from. Bright red blood that shows up only on the toilet paper or sits on the surface of a formed stool typically points to a source very close to the exit: hemorrhoids or a small tear in the skin around the anus (called an anal fissure). Blood that’s mixed into the stool itself suggests the bleeding is happening further up in the colon.
Dark maroon or almost black stool is a different situation entirely. Black, tarry stool usually means the blood has been digested on its way through the intestines, which points to bleeding higher up in the digestive tract, such as in the stomach or small intestine. That kind of bleeding warrants prompt medical evaluation.
The Most Common Causes
Hemorrhoids are the single most common reason for bright red blood in stool. These are swollen veins in the rectum or anus, and they often develop from straining during constipation. They’re usually not serious, and many people deal with them at some point in their lives. You might notice blood on the toilet paper, dripping into the bowl, or coating the outside of the stool. They can itch, burn, or cause discomfort while sitting, but they rarely signal a deeper problem.
Anal fissures are another frequent cause. These are small tears in the lining of the anal canal, often from passing hard or large stools. They tend to cause sharp pain during a bowel movement along with a small amount of bright red blood afterward.
Diverticulosis, a condition where small pouches form in the colon wall, can also produce red stool. About 10% of people with diverticulosis experience some bleeding when hard stool passing through erodes a blood vessel in one of those pouches. The bleeding is usually painless and temporary, but it can produce enough fresh blood to be startling.
Less Common but More Serious Causes
Inflammatory bowel disease, which includes Crohn’s disease and ulcerative colitis, can cause recurring blood in stool along with abdominal pain, diarrhea, and weight loss. These are chronic conditions that require ongoing management, and blood in the stool is often one of the symptoms that leads to diagnosis.
Colon polyps and colorectal cancer can also cause bleeding. Polyps are growths on the inner lining of the colon, and when stool passes over them, it can irritate or damage the tissue and cause it to bleed. Most polyps are benign, but some can develop into cancer over time, which is why screening matters. The U.S. Preventive Services Task Force recommends colorectal cancer screening for adults starting at age 45. People with a family history of colorectal cancer, a personal history of polyps, or inflammatory bowel disease may need screening earlier.
Blood thinners and medications that irritate the digestive tract can also cause rectal bleeding or make existing bleeding worse.
Red Stool in Babies and Children
In children, many of the same food-related causes apply. Red gelatin, fruit punch, and red-dyed snacks are common offenders. But when actual blood is present, the causes are often different from adults.
Newborns sometimes have red or dark stool from swallowing the birth parent’s blood during delivery, or from a cracked, bleeding nipple during breastfeeding. Neither of these involves bleeding from the baby’s own digestive tract. Older children can swallow blood from a nosebleed or after a tonsillectomy, which then shows up in stool. Female newborns can occasionally pass a small amount of blood from the vagina in the first days of life due to hormone withdrawal after birth.
Diaper rash can cause blood to appear around the anus in infants, and constipation-related anal fissures are common in toddlers, especially during toilet training. Less commonly, food allergies or autoimmune conditions affecting the digestive tract can cause blood in a child’s stool.
Signs That Need Immediate Attention
A small amount of bright red blood on toilet paper after a hard bowel movement is common and often resolves on its own. But certain combinations of symptoms call for emergency care. Heavy or continuous rectal bleeding, especially paired with severe abdominal pain or cramping, warrants a trip to the emergency room.
If you’re experiencing rectal bleeding along with rapid or shallow breathing, dizziness when standing up, blurred vision, fainting, confusion, nausea, cold or clammy skin, or very low urine output, these are signs of significant blood loss. Call 911 or have someone take you to the ER immediately. These symptoms indicate your body is struggling to compensate for the volume of blood being lost, regardless of the underlying cause.
For bleeding that’s minor but keeps recurring over days or weeks, or blood that’s mixed into the stool rather than sitting on the surface, a medical evaluation is still important. Persistent changes in stool color, especially in people over 45 or those with a family history of colon cancer, should be investigated rather than assumed to be hemorrhoids.