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Blood in the Stools: Possible Causes of Rectal Bleeding

blood in the toilet bowl

The discovery of blood in the stools can be alarming, prompting individuals to seek answers and understand the potential causes of rectal bleeding. This symptom, often associated with a range of gastrointestinal issues, requires careful consideration and medical attention. 

Understanding Rectal Bleeding

Rectal bleeding refers to the passage of blood through the anus during bowel movements. The blood may be visible in the stool, on toilet paper, or in the toilet bowl. The color of the blood can vary, providing potential clues about its origin. 

Bright red blood may indicate bleeding from the lower digestive tract, while darker, tarry stools suggest bleeding higher up in the gastrointestinal system.

Rectal bleeding is often accompanied by other symptoms, such as abdominal pain, changes in bowel habits, or fatigue. The presence of these additional symptoms can offer valuable insights into the underlying cause.

Possible Causes of Rectal Bleeding


Hemorrhoids are swollen blood vessels in the rectum or anus. They can be internal or external and are a common cause of bright red blood in the stools.


  • Rectal pain or discomfort
  • Itching or irritation around the anus
  • Bulging or lumps felt during bowel movements


  • Over-the-counter creams or ointments
  • Sitz baths to soothe the affected area
  • Dietary modifications, including increased fiber intake

Anal Fissures

Anal fissures are small tears in the lining of the anus, often caused by straining during bowel movements or passage of hard stools.


  • Sharp pain during and after bowel movements
  • Bright red blood on the toilet paper or in the stool
  • Muscle spasms in the anal sphincter


  • Topical creams or ointments to relax the anal sphincter
  • Increased fiber intake to soften stools
  • Sitz baths for pain relief

Gastrointestinal Infections

Infections caused by bacteria, viruses, or parasites in the gastrointestinal tract can lead to inflammation and bleeding.


  • Diarrhea
  • Abdominal cramps
  • Nausea and vomiting


  • Antibiotics for bacterial infections
  • Antiparasitic medications for parasitic infections
  • Supportive care, including hydration and rest

Inflammatory Bowel Disease (IBD)

Conditions like Crohn’s disease and ulcerative colitis fall under the umbrella of IBD, causing chronic inflammation of the digestive tract.


  • Persistent diarrhea
  • Abdominal pain and cramping
  • Fatigue and weight loss


  • Anti-inflammatory medications
  • Immune system suppressors
  • Dietary modifications and lifestyle changes

Colorectal Polyps

Colorectal polyps are growths on the inner lining of the colon or rectum. While most are benign, some may become cancerous over time.


  • Typically asymptomatic but may cause rectal bleeding
  • Changes in bowel habits
  • Abdominal pain


  • Removal of polyps during a colonoscopy
  • Regular monitoring for the presence of new polyps
  • Lifestyle changes to reduce the risk of recurrence

Colorectal Cancer

Colorectal cancer occurs when abnormal cells in the colon or rectum multiply uncontrollably and over years may spread to other parts of the body. It is a serious condition that requires prompt medical attention.


  • Rectal bleeding
  • Changes in bowel habits, such as persistent diarrhea or constipation
  • Abdominal pain or discomfort


  • Surgery to remove the cancerous tissue
  • Chemotherapy or radiation therapy
  • Targeted therapy for specific types of colorectal cancer

Diverticular Disease

Diverticula are small pouches that can form in the walls of the colon. When these pouches become inflamed or infected, it can lead to rectal bleeding.


  • Lower abdominal pain, often on the left side
  • Changes in bowel habits
  • Bloating and gas


  • Antibiotics for infections
  • High-fiber diet to prevent diverticulitis
  • In severe cases, surgery may be necessary

When to Seek Urgent Medical Attention

  • Heavy or Persistent Bleeding: If the bleeding is heavy, persistent, or accompanied by symptoms of shock, immediate medical attention is crucial.
  • Severe Abdominal Pain: Severe abdominal pain, especially if it intensifies rapidly, may indicate a serious underlying issue that requires urgent evaluation.
  • Change in Mental Status: Changes in mental status, such as confusion or lethargy, may be signs of significant blood loss and warrant emergency medical care.


Blood in the stools is a symptom that should never be ignored. While some causes may be benign and self-limiting, others can indicate serious conditions that require prompt medical intervention. Understanding the possible causes, recognizing associated symptoms, and seeking timely medical attention are vital steps in unraveling the mystery of rectal bleeding and ensuring optimal health and well-being. 

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