Rectal Cancer: Causes & Symptoms

What is Rectal Cancer?

Rectal cancer begins in the rectum, which is the final part of your large intestine. Think of it as the last stretch of the digestive system where waste collects before exiting the body.

What Causes Rectal Cancer?

There isn’t one single cause of rectal cancer. Instead, several factors may increase your risk:

1. Age – People over 50 are more likely to develop rectal cancer, although it’s now being found in younger adults too.
2. Family History – If someone in your family has had colorectal cancer or polyps, your risk goes up.
3. Diet & Lifestyle – A diet high in red or processed meats and low in fiber can increase your risk. Smoking, heavy alcohol use, and lack of exercise can also contribute.
4. Inflammatory Bowel Diseases – Long-term conditions like ulcerative colitis or Crohn’s disease irritate the lining of the rectum and may increase the chance of cancer.
5. Genetics – Inherited conditions like Lynch syndrome or familial adenomatous polyposis (FAP) can increase your chances of developing rectal cancer at a younger age.

What are the Symptoms of Rectal Cancer?

One of the tricky things about rectal cancer is that early on, it might not cause any symptoms at all. But as the cancer grows, here are some common signs:

1. Rectal Bleeding – Seeing blood in your stool or on the toilet paper? Don’t ignore it.
2. Changes in Bowel Habits – Diarrhea, constipation, or feeling that your bowel isn’t emptying fully.
3. Narrow or Ribbon-like Stools – A tumor in the rectum may cause the stool to become thinner than normal.
4. Persistent Abdominal Discomfort – Cramping, gas, bloating, or pain in your lower stomach area.
5. Fatigue and Weakness – Slow blood loss through the stool can lead to anemia.
6. Unexplained Weight Loss – Losing weight without trying is often a red flag.

Rectal Cancer vs Colon Cancer: What’s the Difference?

Many people use the terms colon cancer and rectal cancer interchangeably. While they’re both types of colorectal cancer, they aren’t exactly the same.

• Colon cancer affects the upper part of the large intestine.
• Rectal cancer is found in the last 6 inches of the large intestine, just before the anus.

Because of the rectum’s location, rectal cancer can be more complicated to treat.

When Should You See a Doctor?

If you have any of the above symptoms—especially if they last longer than a couple of weeks—it’s time to speak with a doctor.

Also, if you’re over 45, even without symptoms, talk to your doctor about getting screened.

Diagnosis: How Rectal Cancer is Found

Doctors use several tools to find and confirm rectal cancer:

• Colonoscopy
• Blood Tests
• Imaging Tests (MRI, CT, PET)

Once cancer is confirmed, doctors will determine the stage, which helps guide treatment.

Staging Rectal Cancer

Staging tells us how far the cancer has spread:

• Stage 0: Very early stage, only affecting the inner lining.
• Stage I-II: Cancer has spread deeper but not to the lymph nodes.
• Stage III: Reached nearby lymph nodes.
• Stage IV: Spread to distant organs.

Treatment Options

Treatment depends on the stage, location, and your overall health. Here are the most common treatments:

• Surgery
• Radiation Therapy
• Chemotherapy
• Targeted Therapy & Immunotherapy

Can Rectal Cancer Be Prevented?

While not all cases can be prevented, you can reduce your risk:

• Eat more fruits, vegetables, and whole grains.
• Limit red and processed meats.
• Stay active.
• Quit smoking.
• Get screened regularly.

Looking for Help in Pune?

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Conclusion

Rectal cancer might not be the most talked-about illness, but that doesn’t make it any less important. The good news is: it’s treatable—especially when caught early.

Know the symptoms. Take action. Get screened. Your health is too important to ignore.

Frequently Asked Questions (FAQs)

1. What is rectal cancer?

Rectal cancer is a type of cancer that develops in the rectum—the final section of the large intestine. It often starts as non-cancerous polyps that can become cancerous over time if not detected early.

2. What causes rectal cancer?

Risk factors include age (especially over 50), a family history of colorectal cancer, poor diet (high in red or processed meats), smoking, alcohol use, inflammatory bowel diseases, and genetic conditions like Lynch syndrome or FAP.

3. What are the early symptoms of rectal cancer?

Early stages may show no symptoms, but common signs include rectal bleeding, changes in bowel habits, narrow stools, abdominal discomfort, fatigue, and unexplained weight loss.

4. How is rectal cancer diagnosed?

Doctors typically use colonoscopy, blood tests, and imaging tests such as MRI, CT, or PET scans to detect and confirm rectal cancer.

5. How is rectal cancer different from colon cancer?

While both are types of colorectal cancer, colon cancer affects the upper part of the large intestine, while rectal cancer occurs in the last 6 inches of the colon, near the anus.

6. Can rectal cancer be prevented?

While not entirely preventable, you can reduce your risk by eating a high-fiber diet, staying physically active, avoiding smoking and alcohol, and getting regular screenings—especially if you're over 45 or have a family history.