What does it mean when there is blood in the stool?

Many people experience rectal bleeding in daily life, yet most do not take it seriously—often attributing it to “excessive internal heat” or constipation. In fact, rectal bleeding may also signal colorectal cancer. Therefore, if you notice blood in your stool, it is advisable to undergo medical evaluation. So, what exactly causes rectal bleeding? Let’s explore this further.

What Causes Rectal Bleeding?

1. Internal Hemorrhoids

Rectal bleeding has numerous potential causes, and internal hemorrhoids are among the most common. Bleeding is a hallmark symptom of internal hemorrhoids. Characteristically, the volume of blood loss is substantial—sometimes even spurting—especially during episodes of constipation. The blood appears bright red and does not mix with the stool; it typically coats the surface or drips separately. Anal pain often accompanies the bleeding.

2. Colorectal Cancer

Rectal bleeding is one of the classic symptoms of colorectal cancer. Other associated signs include bloody or purulent stools, narrowing of stool caliber, and abdominal pain. Blood usually adheres to the stool surface, appearing as drops, and may be bright red or dark red in color.

3. Anal Fissure

Amoebic dysentery can also cause rectal bleeding, presenting with dark-red blood in relatively large amounts, frequently mixed with purulent mucus. Patients may also experience fever, abdominal distension, and abdominal pain. Additionally, individuals with a history of exposure to schistosomiasis-endemic water (i.e., contact with contaminated freshwater) may develop rectal bleeding due to schistosomiasis.

The above outlines the primary causes of rectal bleeding. Upon noticing rectal bleeding, carefully observe the characteristics of the bleeding—such as color, volume, consistency, and accompanying symptoms—to help identify the underlying cause. It is highly recommended to seek prompt medical evaluation at a hospital for accurate diagnosis and targeted treatment. We hope this information proves helpful to you.