Noticing blood in the toilet after a bowel movement may seem harmless, but doctors warn that rectal bleeding can signal serious digestive conditions, including colorectal cancer. Here are five possible causes and why medical attention should never be delayed.
For many people, noticing blood in their stool is an uncomfortable experience they would rather keep private. Some blame constipation, while others assume it is haemorrhoids (piles) and hope the bleeding will disappear.
But medical experts warn that blood in stool should never be casually dismissed because its causes range from relatively common conditions to potentially life-threatening diseases.
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The colour of the blood can offer important clues. Bright red blood may indicate bleeding around the anus, rectum or lower digestive tract, while black, tar-like stool may point to bleeding higher up in the digestive system.
According to the US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), several conditions can cause gastrointestinal bleeding. Five important possibilities include:
1. Haemorrhoids (Piles)
Haemorrhoids develop when veins around the anus or lower rectum become swollen. They can cause bright red blood on toilet paper, on the surface of stool or in the toilet bowl.
Constipation, straining during bowel movements and prolonged sitting on the toilet can contribute to the condition.
Although haemorrhoids are common and treatable, recurring bleeding should be medically investigated rather than automatically attributed to piles.
2. Gastritis and Peptic Ulcers
Gastritis involves inflammation of the stomach lining, while peptic ulcers are sores that develop in the stomach or upper small intestine.
According to NIDDK, common causes of peptic ulcers include Helicobacter pylori (H. pylori) bacterial infection and prolonged use of certain painkillers, including ibuprofen and aspirin.
When these conditions cause gastrointestinal bleeding, stool may become black and tar-like, indicating possible bleeding higher up in the digestive tract.
3. Anal Fissures
An anal fissure is a small tear in the lining of the anus, commonly associated with passing hard stool or straining.
It can cause sharp pain during bowel movements, accompanied by small amounts of bright red blood on toilet paper or stool.
Although some fissures heal with appropriate treatment, persistent pain or bleeding requires medical assessment.
4. Colorectal Cancer
One of the most concerning possible causes is cancer affecting the colon or rectum.
The American Cancer Society identifies rectal bleeding, blood in stool, persistent changes in bowel habits, unexplained weight loss and abdominal discomfort among possible warning signs.
Colorectal cancer may not produce noticeable symptoms in its early stages, making medical assessment particularly important.
Colorectal surgeon Dr Zuri Murrell of Cedars-Sinai has warned that recurring bleeding deserves investigation, particularly when it happens repeatedly regardless of whether stool is hard or soft.
Blood in stool does not automatically mean cancer, but assuming it is harmless could delay diagnosis.
5. Inflammatory Bowel Disease (IBD)
Crohn’s disease and ulcerative colitis are chronic conditions that cause inflammation in the digestive tract.
They can result in bloody diarrhoea, abdominal cramps, persistent diarrhoea, fatigue and unintended weight loss.
Unlike irritable bowel syndrome (IBS), inflammatory bowel disease can cause physical damage to the intestinal lining and bleeding.
When Should You Seek Medical Attention?
Medical professionals advise against ignoring unexplained blood in stool, even when only a small amount is visible.
Bright red bleeding, recurring episodes and unexplained changes in bowel habits warrant medical assessment.
Black, tar-like stool, heavy or continuous bleeding, large blood clots, dizziness or fainting require urgent medical attention.
Depending on the suspected cause, a doctor may recommend blood tests, stool tests, an endoscopy or colonoscopy to establish the source of bleeding.
The Bottom Line
Blood in stool is a symptom, not a diagnosis. It may result from relatively common conditions such as haemorrhoids and anal fissures, but it can also signal peptic ulcers, inflammatory bowel disease or colorectal cancer.
The biggest mistake is assuming that the bleeding will disappear on its own or treating it without establishing its cause.
Seeking medical attention early could help identify an underlying condition before it becomes more serious.
Health information disclaimer: This article is intended for public awareness and does not replace professional medical advice, diagnosis or treatment.
