Rectal bleeding can have several possible causes, ranging from common conditions such as haemorrhoids and anal fissures to inflammation, bowel ulcers, polyps and colorectal cancer. While some causes may be relatively minor, persistent or unexplained bleeding may require further assessment, particularly when it occurs alongside abdominal pain, diarrhoea or changes in bowel habits. Bowel ulcerations can sometimes contribute to bleeding when the lining of the colon becomes inflamed or damaged.
A colonoscopy Singapore procedure allows a doctor to examine the lining of the rectum and colon directly, helping to identify ulcerations, inflammation, polyps or other potential sources of bleeding. Learn more here https://www.leesurgery.com.sg/service/colonoscopy/ about colonoscopy and what the procedure involves.
What Are Bowel Ulcerations and What Can Cause Them?
Bowel ulcerations are areas where the lining of the intestine has become damaged, resulting in an open sore or erosion. They can occur in different parts of the digestive tract and may have several underlying causes. In the colon, ulcerations may be associated with inflammatory bowel diseases such as ulcerative colitis or Crohn’s disease, as well as certain infections, medications or other forms of bowel inflammation.
The location, number and appearance of the ulcerations can provide useful clues about their cause. However, seeing an ulcer alone may not be enough to determine the diagnosis. A doctor may consider the patient’s symptoms, medical history and other investigations, including biopsies taken during a colonoscopy, to understand why the ulcerations have developed.
How Rectal Bleeding May Be Linked to Bowel Ulcerations
Bowel ulcerations can cause bleeding when the damaged lining of the intestine becomes inflamed and prone to bleeding. The amount of blood may vary, and some people may notice visible blood in their stool while others may have bleeding that is only detected through testing. Rectal bleeding may also occur alongside symptoms such as persistent diarrhoea, abdominal discomfort, mucus in the stool or changes in bowel habits.
These symptoms are not specific to bowel ulcerations and can occur with other gastrointestinal conditions as well. For this reason, the pattern and duration of symptoms are important when determining whether further investigation is needed. A doctor may recommend a colonoscopy to examine the bowel directly and investigate a possible source of bleeding.
When Does Rectal Bleeding Warrant a Colonoscopy?
Not every episode of rectal bleeding requires a colonoscopy, but persistent, recurrent or unexplained bleeding may warrant further investigation. This is particularly relevant when bleeding occurs together with changes in bowel habits, persistent diarrhoea, abdominal pain, unexplained weight loss or signs of anaemia.
A colonoscopy may also be considered when there are risk factors such as a personal or family history of colorectal conditions. While haemorrhoids are a common cause of bright red rectal bleeding, their presence does not necessarily rule out another condition occurring at the same time.
Colonoscopy allows the rectum and colon to be examined directly, helping to determine whether ulcerations, inflammation, polyps or other abnormalities could be responsible for the bleeding.
What Can Colonoscopy Singapore Identify?
A colonoscopy allows a doctor to examine the lining of the rectum and colon using a flexible camera. It can help identify abnormalities that may explain rectal bleeding, including:
- Bowel ulcerations: Areas where the bowel lining has become damaged or eroded.
- Inflammation: Changes that may be associated with conditions such as inflammatory bowel disease.
- Polyps: Growths that can vary in size and type, with some requiring removal or further assessment.
- Diverticular disease: Small pouches in the bowel wall that can sometimes cause bleeding.
- Suspicious growths: Abnormal areas that may require further investigation to determine whether they are cancerous or non-cancerous.
If an ulceration or another abnormal area is found, a small tissue sample may be taken for laboratory analysis. This biopsy can provide additional information about the underlying cause, such as inflammation, infection or inflammatory bowel disease.
Why Identifying the Cause of Ulceration Matters
Finding a bowel ulceration during colonoscopy does not necessarily reveal its underlying cause. Different conditions can produce similar-looking changes in the bowel lining, so further assessment may be needed. The doctor may consider factors such as:
- The location of the ulceration: Whether it occurs in the rectum, colon or multiple areas of the bowel.
- The number and appearance of ulcers: Their size, shape and surrounding inflammation can provide diagnostic clues.
- Other bowel findings: Polyps, narrowing, bleeding or widespread inflammation may provide additional context.
- Biopsy results: Tissue samples can be examined under a microscope to look for features associated with inflammation, infection or other abnormalities.
- Symptoms and medical history: Abdominal pain, diarrhoea, changes in bowel habits, medication use and previous gastrointestinal conditions can help put the findings into context.
Establishing the cause is important because treatment depends on the underlying condition. An ulceration caused by inflammatory bowel disease, for example, may be managed differently from one associated with an infection or medication.
Conclusion
Rectal bleeding can arise from several conditions, including bowel ulcerations, inflammation, polyps and other colorectal problems. When bleeding is persistent, recurrent or accompanied by other bowel symptoms, further investigation may help identify the underlying cause and guide appropriate management.
Persistent rectal bleeding should not be ignored. To discuss your symptoms and available assessment options, contact our clinic, at:
Dr Lee Chin Li – Lee Surgery and Endoscopy | Colorectal Surgery | Gallbladder Surgery Singapore
6 Napier Rd, #04-16 Gleneagles Medical Centre, Singapore 258499
Phone: +65 6255 0720
