Call Us

Contact Us

Colon Cancer: Symptoms, Stages, and Outlook

woman lying on her side with stomach pain

Colon cancer, also known as colorectal cancer, is a prevalent and potentially life-threatening condition that arises from abnormal cell growth in the colon or rectum. Understanding the symptoms, stages, and outlook of colon cancer is crucial for early detection and effective management. 

In this comprehensive guide, we will explore the various facets of colon cancer, from its initial signs to the stages of progression and the overall outlook for those affected.

Recognizing Symptoms

Below are some of the most common colon cancer symptoms:

  • Changes in Bowel Habits: Persistent changes in bowel habits, such as diarrhea, constipation, or a change in stool consistency, can be early indicators of colon cancer.
  • Blood in Stool: Rectal bleeding or the presence of blood in the stool, either visible or detected through fecal occult blood tests, should be promptly investigated.
  • Abdominal Discomfort: Persistent abdominal pain, cramps, or discomfort, especially if accompanied by bloating, may be a sign of colorectal issues.
  • Unexplained Weight Loss: Unintentional weight loss not attributed to diet or lifestyle changes can be a concerning symptom of various cancers, including colon cancer.
  • Fatigue and Weakness: Persistent fatigue and weakness that do not improve with rest could be indicative of an underlying health issue, including advanced-stage colon cancer.

Stages of Colon Cancer

  • Stage 0 (Carcinoma in Situ): Cancer cells are found only in the innermost lining of the colon or rectum and have not invaded deeper layers.
  • Stage I: Cancer has invaded the inner lining of the colon or rectum but has not spread beyond the wall.
  • Stage II: Cancer has grown through the wall of the colon or rectum but has not yet spread to nearby lymph nodes.
  • Stage III: Cancer has spread to nearby lymph nodes but has not metastasized to distant sites.
  • Stage IV: Cancer has metastasized to distant organs or tissues, such as the liver, lungs, or other distant lymph nodes.

Diagnostic Methods


A colonoscopy is a key diagnostic tool for colon cancer. It allows for the direct visualization of the colon and rectum, enabling the detection and removal of precancerous polyps.


Tissue samples obtained through a biopsy during a colonoscopy or surgery are examined under a microscope to confirm the presence of cancerous cells and determine their characteristics. Before diagnosis of cancer, biopsies need to be obtained for examination. 

Imaging Studies

CT scans, MRI, and PET scans may be used to determine the extent of cancer spread and identify potential metastases.

Blood Tests

Blood tests, including carcinoembryonic antigen (CEA) levels, may be monitored to assess the response to treatment and detect potential recurrence.

Treatment Approaches


Surgical removal of the tumor is a common approach for early-stage colon cancer. Depending on the stage and location, the surgery may involve removing a portion of the colon or rectum (colectomy).


Chemotherapy may be recommended, especially for advanced-stage colon cancer. It involves the use of drugs to kill cancer cells or stop their growth. In some cases, it is used before surgery to shrink the cancer size (neoadjuvant chemotherapy). 

Radiation Therapy

Radiation therapy may be employed to target and destroy cancer cells. It is often used in conjunction with surgery or chemotherapy.

Targeted Therapy

Targeted therapies, such as monoclonal antibodies, aim to specifically target cancer cells while minimizing damage to healthy cells.

Prognosis and Survival Rates

Survival Rates by Stage

The prognosis for colon cancer varies significantly based on the stage at diagnosis. Generally, earlier stages (I and II) have higher survival rates compared to advanced stages (III and IV).

Five-Year Survival Rates

The five-year survival rate for localized colon cancer is around 90%, highlighting the importance of early detection and intervention. Advanced-stage colon cancer (Stage IV) has a lower five-year survival rate, emphasizing the challenges of treating metastatic disease.

Individual Factors

Prognosis is influenced by individual factors such as age, overall health, and the effectiveness of treatment. Younger individuals and those with well-tailored treatment plans may have improved outcomes.

Coping with Diagnosis

Emotional Support

Receiving a colon cancer diagnosis can be emotionally overwhelming. Seeking support from loved ones, friends, or support groups can help individuals cope with the emotional challenges.

Patient Advocacy

Engaging with patient advocacy organizations and participating in support programs can provide valuable resources, information, and a sense of community for individuals facing colon cancer.

Prevention and Early Detection

  • Regular Screening: Regular screenings, such as colonoscopies, are crucial for early detection and the removal of precancerous polyps before they become malignant.
  • Healthy Lifestyle: Adopting a healthy lifestyle, including a balanced diet rich in fiber, regular exercise, and avoiding tobacco and excessive alcohol consumption, can contribute to colorectal health.
  • Know Your Family History: Individuals with a family history of colon cancer or certain hereditary conditions may be at higher risk. Knowing one’s family history allows for tailored screening recommendations.


Colon cancer is a significant health concern with the potential for effective prevention, early detection, and treatment. Recognizing the symptoms, understanding the stages of progression, and being aware of available diagnostic and treatment options are essential components of addressing this disease.


Introducing Curasia Endoscopy Centre

Our host, Jerald Foo, will be taking you to our first centre at Jurong East.

Make An Enquiry

Leave us your details and we’ll get back to you shortly.
Prefer to talk? Call our clinic directly to make an enquiry at +65 6679 1229

or Whatsapp us at +65 9750 8783

We are available 24 hours

Let's Get in Touch!

Clinic Details

Other Related Articles

Call Us

Contact Us