Rectal Cancer — Types, Symptoms & When to See a Specialist

What is Rectal Cancer?

Rectal cancer occurs when cells in the rectum — the last 15 centimetres of the large bowel that connects the colon to the anus — begin to grow uncontrollably and form a tumour. Most rectal cancers start as a small, harmless-looking growth (polyp) on the rectal lining and slowly turn cancerous over years. This long pre-cancerous window is precisely what makes rectal cancer one of the most preventable and detectable cancers when screening is used.

Rectal cancer is rising in incidence across India, with a particularly worrying trend in younger adults under 50 — many of whom are diagnosed late because their symptoms are dismissed as piles or routine indigestion. Diets low in fibre, high in processed foods and red meat, rising rates of obesity and diabetes, and decreasing physical activity are all contributing. The good news is that rectal cancer found early is one of the most curable cancers, and screening colonoscopy in those over 50 (or earlier with a family history) can detect and remove pre-cancerous polyps before they ever become cancer.

Common Signs & Symptoms of Rectal Cancer

Rectal cancer often produces symptoms that are easy to dismiss as piles, fissures or routine bowel issues. Watch for any of the following — especially if they last more than 3 weeks:

• Bleeding while passing stools — bright red or dark blood in the stool, or blood mixed with the stool (not just on toilet paper).
• A persistent change in bowel habit — new constipation, diarrhoea, or alternating between the two.
• Tenesmus — a feeling of incomplete emptying after passing stools.
• Pencil-thin stools — or a noticeable change in stool shape.
• Unexplained iron-deficiency anaemia — often the first lab finding in older men or postmenopausal women.
• Persistent pain or discomfort — in the lower abdomen or rectum.
• Unexplained weight loss — loss of appetite, or persistent tiredness.
• Mucus discharge from the rectum.

Any of these symptoms lasting more than 3 weeks deserves a colonoscopy — not just treatment for presumed piles.

Rectal Cancer in Telangana & Andhra Pradesh

Rectal cancer is rising steadily across Telangana and Andhra Pradesh, and a worrying share of new diagnoses are now in adults under 50 — many of whom were treated for piles or fissures for months before the cancer was recognised. Three regional drivers stand out: shifting diets (more refined carbohydrates, processed and packaged foods, red meat; less fibre and traditional millet-based grains), rapidly rising obesity and type 2 diabetes, and a deep-rooted social discomfort about discussing bowel symptoms, which causes people to delay seeing a doctor.

Anyone with rectal bleeding, a persistent change in bowel habit, or new pencil-thin stools should have a colonoscopy — irrespective of age — rather than continued treatment for presumed piles.

Common Causes & Risk Factors

Rectal cancer typically develops slowly over years, often from a polyp. The main risk factors are:

• Age above 50 — although incidence is rising in younger adults.
• Family history — of colorectal cancer or adenomatous polyps.
• Inherited syndromes — Lynch syndrome and familial adenomatous polyposis (FAP).
• Personal history of polyps or IBD — colorectal polyps or inflammatory bowel disease (ulcerative colitis, Crohn's disease).
• Diets high in red and processed meat — low in fibre.
• Obesity and physical inactivity.
• Type 2 diabetes.
• Smoking and heavy alcohol use.
• Previous radiation therapy — to the abdomen or pelvis.

When to See a Rectal Cancer Specialist

Any of the following should prompt a colonoscopy and specialist review, regardless of age:

• Rectal bleeding — that persists, recurs, or is mixed with the stool.
• A new change in bowel habit — lasting more than 3 weeks.
• Tenesmus — the feeling of needing to pass stool even after you just have.
• Pencil-thin stools — or noticeably narrower stools.
• Unexplained iron-deficiency anaemia — especially in men or postmenopausal women.
• A family history of colorectal cancer or polyps — screening from age 40 or earlier may be appropriate.
• Continued bleeding despite treatment for piles.

A short specialist consultation and the right diagnostic test — imaging, endoscopy, biopsy, or blood test as appropriate — is usually enough to confirm or rule out cancer. Early action is always easier than catching up later.

Specialist Rectal Cancer Care at CION Cancer Clinics

Our NABH-accredited centres across Hyderabad deliver evidence-based rectal cancer care — from colonoscopy and MRI staging through to laparoscopic and robotic-assisted sphincter-preserving surgery, total mesorectal excision (TME), neoadjuvant chemoradiotherapy, modern systemic therapy and stoma care — guided by NCCN and ESMO protocols and reviewed for every patient by a multidisciplinary tumour board.

For a detailed walk-through of rectal cancer diagnosis, treatment options, costs, and our specialist team, see our dedicated page on rectal cancer treatment in Hyderabad.

Disclaimer: This page is intended for general informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified oncologist for guidance specific to your medical condition. Content on this page is periodically reviewed and updated by CION's medical team in accordance with current clinical guidelines.