What Symptoms Indicate the Need for Transanal Endoscopy?

Rectal bleeding, a change in bowel habits or a feeling that you cannot fully empty your bowels are symptoms many people dismiss as piles or a temporary stomach upset. Often that is exactly what they are. Sometimes, however, they point to a polyp or early growth in the rectum that needs to be examined and, in selected cases, removed through a minimally invasive procedure such as transanal endoscopic microsurgery.

This article explains which symptoms should prompt a medical check, how doctors work out whether a rectal growth needs removal, and when a transanal approach may be recommended. It is not meant to diagnose yourself, but to help you recognise warning signs and know what to expect from the process.

Why the Rectum Matters

The rectum is the last part of the large bowel, just above the anus. Growths here include benign polyps, which are non-cancerous but can turn cancerous over time, and early rectal cancers confined to the inner layers of the bowel wall. Because they sit close to the anus, small lesions can often be reached and removed without opening the abdomen.

Many rectal polyps cause no symptoms at all and are discovered during screening colonoscopy. That is one reason screening matters, and why symptoms, when they do appear, should never be ignored.

Symptoms That May Point to a Rectal Growth

The following signs can be caused by a polyp or early tumour in the rectum:

• Blood in the stool or on the toilet paper. Bright red blood is common with piles, but it can also come from a polyp or cancer, so persistent bleeding should be checked.
• Mucus discharge. Passing mucus from the back passage, sometimes with stool, may be caused by a larger growth, particularly a villous type of polyp.
• A change in bowel habits. This includes new constipation, loose stools or both, lasting more than a few weeks.
• A feeling of incomplete emptying. The sensation that you still need to go, even after opening your bowels, can be caused by a growth in the rectum.
• Narrower stools or straining. Persistent changes in stool shape or difficulty passing stools may suggest a blockage.
• Rectal fullness, discomfort or pain. A dull ache, pressure or a sense that something is there should be assessed.
• A mass or tissue prolapsing through the anus. Occasionally, a polyp can protrude during a bowel movement.
• Tiredness or pale skin. Slow, unnoticed bleeding can lead to iron deficiency anaemia.
• Watery diarrhoea and weakness. Very rarely, a large villous adenoma can cause heavy mucus secretion, diarrhoea and low blood salts.

None of these symptoms means you have a serious condition, and they overlap strongly with common problems like haemorrhoids and irritable bowel. The point is that persistent or unexplained symptoms deserve investigation.

Red Flags That Need Prompt Attention

See a doctor soon if you notice:

• Rectal bleeding that is recurrent, heavy or unexplained
• A persistent change in bowel habit lasting more than three to four weeks
• Unexplained weight loss or loss of appetite
• Black or tarry stools
• New iron deficiency anaemia
• A family history of bowel cancer or polyps together with any of the above

Go to the emergency department if bleeding is heavy, if you feel faint or if you have severe abdominal pain.

How Doctors Investigate

Your doctor will take a history and may perform a gentle rectal examination. To look directly at the bowel lining, you will usually need a colonoscopy or flexible sigmoidoscopy, which allows the doctor to see polyps, take biopsies and sometimes remove small ones during the same procedure.

If a growth is found, further tests may include:

• Biopsy and pathology to check for abnormal or cancerous cells
• MRI of the pelvis or endorectal ultrasound to see how deep the lesion extends into the bowel wall
• CT scan if cancer is suspected, to check for spread
• Blood tests including a full blood count to look for anaemia

These tests help the team decide between observation, endoscopic removal, local surgery or a larger operation.

When Is Transanal Surgery Recommended?

Transanal endoscopic microsurgery, often shortened to TEM, is considered when a rectal lesion cannot be safely removed through a colonoscope but does not need a major operation. Typical situations include:

• Large benign polyps that are too big or too flat to remove with a standard scope
• Polyps that have come back after previous attempts at removal
• Lesions where the colonoscopy removal was incomplete
• Selected early rectal cancers that are small, confined to the inner layers of the bowel wall and show no signs of spread
• Growths with uncertain pathology where a full-thickness sample is needed to make a diagnosis

TEM and related techniques allow the surgeon to remove the growth with a margin of healthy tissue through the anus, avoiding an abdominal incision and, often, a stoma.

When It May Not Be Suitable

Transanal surgery is not right for every rectal lesion. It may not be appropriate if:

• The tumour is large, deeply invasive or has high-risk features on pathology
• There are signs that cancer has spread to lymph nodes or other organs
• The lesion sits too high in the rectum for the equipment to reach
• Other medical conditions make the procedure unsafe

In these cases, a different operation or treatment, such as radiotherapy, chemotherapy or major bowel surgery, may be recommended. Many centres review difficult cases in a multidisciplinary team meeting so that colorectal surgeons, radiologists, pathologists and oncologists can agree the best plan.

What to Expect If Surgery Is Advised

The procedure is usually done under general anaesthesia, and many patients stay in hospital for a day or two or go home the same day. Afterwards you may notice mild discomfort, spotting or a changed bowel pattern for a short time. The removed tissue is examined under a microscope, and the results guide whether further treatment or closer follow-up is needed. Regular surveillance scopes are common afterwards, since polyps can recur.

When to See a Doctor

Book an appointment if you have any of the symptoms listed above for more than a few weeks, if you are over 45 or 50 and have never had bowel screening, or if you have a family history of polyps or bowel cancer. Do not assume that bleeding is always from piles. A quick assessment can bring reassurance or lead to earlier treatment.

Final Thoughts

Symptoms such as bleeding, mucus, changes in bowel habit or a feeling of incomplete emptying do not always mean something serious, but they are worth checking, especially if they persist. When a polyp or early growth is found in the rectum, treatments like transanal endoscopic microsurgery can remove it through the anus without major surgery. If something about your bowel habits has changed and does not settle, speak to your doctor early rather than waiting.

Frequently Asked Questions

1. Do rectal polyps always cause symptoms?
   No. Many cause none and are found during screening. This is why screening colonoscopy is recommended even when you feel well.
2. Is rectal bleeding always a sign of cancer?
   No. Haemorrhoids and small tears are common causes. However, persistent or unexplained bleeding should be checked to rule out polyps or cancer.
3. Who is a candidate for transanal surgery?
   Typically people with large benign polyps that cannot be removed through a colonoscope, recurrent polyps or selected early rectal cancers without signs of spread. Your surgeon will decide after tests.
4. Will I need a stoma after transanal surgery?
   Usually not. Because the procedure is done through the anus without opening the abdomen, a stoma is rarely needed.
5. What happens after the growth is removed?
   The tissue is examined in the laboratory. Depending on the result, you may need only follow-up scopes, or further treatment if the pathology shows high-risk features.