What Is Colorectal Cancer? What Are the Symptoms?
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Overview
Colorectal cancer (CRC) is a cancer that starts in the colon (large bowel) or rectum. It typically begins as small growths called polyps on the inner lining of the intestine. While most polyps are benign at first, a subset can gradually become cancerous over time. When detected early, colorectal cancer is often highly treatable; when undiagnosed or untreated, it can grow through the bowel wall and spread (metastasize) to lymph nodes and distant organs.
At MedicalPoint Hospital, our Gastroenterology, General Surgery, Medical Oncology, Radiology, and Pathology teams collaborate to deliver guideline-based screening, diagnosis, treatment, and follow-up.
What Is Colorectal Cancer?
The colon absorbs water and nutrients and forms stool; the rectum stores stool before elimination. Colorectal cancers usually start in the mucosa (the innermost lining) when cells acquire genetic changes, forming adenomatous or serrated polyps. Without removal, some polyps can transform into cancer over years.
Key points:
- CRC includes colon cancer (tumor in the colon) and rectal cancer (tumor in the rectum).
- Tumors may extend through muscle layers, reach lymph nodes, and spread to the liver, lungs, or peritoneum.
Because early disease can be silent, screening colonoscopy and stool-based tests are critical.
Why Does Colorectal Cancer Occur?
Like all cancers, CRC results from uncontrolled cell growth due to cumulative DNA changes. You can have risk factors without ever developing cancer, but the following are linked with a higher likelihood:
- Age: risk increases with age.
- Family history & genetics: a first-degree relative with CRC or advanced polyps; Lynch syndrome (HNPCC) and Familial Adenomatous Polyposis (FAP) raise risk substantially.
- Personal history: prior CRC or certain advanced polyps.
- Inflammatory bowel disease: long-standing ulcerative colitis or Crohn’s colitis.
- Lifestyle factors: diets high in processed meats and very high in red meat, low fiber intake, physical inactivity, obesity, smoking, and alcohol.
Other contributors: type 2 diabetes, prior abdominal/pelvic radiation, and factors that impair bowel health.
Symptoms of Colorectal Cancer
Early CRC may cause no symptoms. When present, symptoms can vary by tumor location and stage:
- Blood in the stool: bright red, maroon, or black stools; or blood on toilet paper. (Hemorrhoids can also bleed—medical evaluation is essential.)
- Change in bowel habits: persistent constipation, diarrhea, narrower stool caliber, or a feeling of incomplete emptying.
- Abdominal pain, cramping, or bloating.
- Unintentional weight loss or reduced appetite.
- Fatigue and shortness of breath due to iron-deficiency anemia.
- Nausea or vomiting, especially if frequent or associated with abdominal distention.
Any persistent change in bowel habits or rectal bleeding deserves prompt assessment.
Stages of Colorectal Cancer
Staging describes how far cancer has spread and guides treatment:
- Stage 0 (carcinoma in situ): abnormal cells limited to the mucosa.
- Stage I: tumor invades into the bowel wall but not beyond the muscle; no lymph nodes involved.
- Stage II (IIA–IIC): tumor grows through the wall and may contact nearby structures, without lymph node spread.
- Stage III: any depth of tumor with regional lymph node involvement.
- Stage IV (IVA–IVC): metastatic disease—spread to distant organs (e.g., liver, lungs) or the peritoneum.
Clinicians use the TNM system (Tumor, Nodes, Metastasis) plus imaging and pathology to assign an exact stage.
How Is Colorectal Cancer Diagnosed?
Diagnosis combines history, examination, endoscopy, and imaging:
- Colonoscopy (gold standard): a flexible camera inspects the entire colon and rectum, allows polyp removal (polypectomy or endoscopic mucosal resection), and enables biopsy of suspicious lesions.
- Stool-based tests:
- FIT/gFOBT: detect hidden (occult) blood in stool.
- Stool DNA tests: identify abnormal DNA shed by advanced polyps/cancers.
- Flexible sigmoidoscopy: evaluates the rectum and left colon (useful in selected cases).
- CT colonography (“virtual colonoscopy”): imaging alternative when standard colonoscopy is not feasible.
- Blood tests: complete blood count for anemia; CEA (carcinoembryonic antigen) for baseline and follow-up in confirmed CRC.
- Imaging for staging: CT or MRI of chest/abdomen/pelvis to evaluate spread; dedicated rectal MRI for rectal tumors.
Screening matters: Many adults at average risk are advised to start screening around age 45; those with family history or IBD may need earlier and more frequent testing. Your MedicalPoint clinician will tailor a plan to your risk level.
How Is Colorectal Cancer Treated?
Treatment is individualized based on stage, tumor site, overall health, and patient preferences. Core modalities include:
1) Surgery (Mainstay for Most Localized Cancers)
- Polypectomy / endoscopic resection: for select early lesions found at colonoscopy.
- Partial colectomy (segmental colon resection): removes the tumor with clear margins and nearby lymph nodes; the healthy ends are usually rejoined (anastomosis).
- Stoma (colostomy/ileostomy): temporary or permanent, when a safe reconnection is not possible or to protect a new anastomosis.
- Rectal cancer: often managed with neoadjuvant chemoradiation (before surgery) to shrink the tumor and reduce local recurrence, followed by total mesorectal excision.
2) Systemic Therapy
- Chemotherapy: may be given after surgery (adjuvant) to lower recurrence risk in appropriate stages, before surgery in select cases, or for metastatic disease to control growth and symptoms.
- Targeted therapy: medications directed at tumor pathways (e.g., anti-EGFR agents for RAS-wild-type tumors; anti-VEGF agents in metastatic disease) guided by molecular profiling.
- Immunotherapy: checkpoint inhibitors for tumors with microsatellite instability-high (MSI-H) or mismatch repair deficiency (dMMR).
3) Radiation Therapy
- Used routinely in rectal cancer (pre-/post-operative) and selectively in metastatic or symptomatic settings.
4) Supportive Care & Survivorship
- Nutrition therapy to maintain weight and strength.
- Physical activity to reduce fatigue, preserve function, and support recovery.
- Management of treatment effects: bowel habit changes, neuropathy, anemia.
- Surveillance plan: colonoscopies and periodic tests to detect recurrence or new polyps early.
At MedicalPoint Hospital, each case is reviewed at a multidisciplinary tumor board to ensure you receive the most effective, evidence-aligned plan.
Frequently Asked Questions
What does “colorectal cancer” mean?
A cancer arising from the colon or rectum. It often begins as a polyp and can become malignant over time. Early detection and appropriate treatment significantly improve outcomes.
Can colorectal cancer be prevented?
There is no guaranteed prevention, but you can lower risk by screening regularly, not smoking, limiting alcohol, maintaining a healthy weight, being physically active, and eating a fiber-rich diet (whole grains, fruits, vegetables) while limiting processed meats.
Does colorectal cancer recur?
It can recur. That’s why a structured follow-up plan—surveillance colonoscopy, clinical assessments, and imaging/labs when indicated—is essential after treatment.
When should I seek urgent care?
Severe or ongoing rectal bleeding, signs of bowel blockage (intense abdominal pain, vomiting, inability to pass gas/stool), or rapid worsening fatigue/dizziness (possible significant anemia) all warrant urgent medical assessment.
Why Choose MedicalPoint Hospital?
- Comprehensive Colorectal Service: expert endoscopy, minimally invasive surgery, pathology, medical oncology, radiation oncology, dietetics, and psycho-oncology under one roof.
- Advanced diagnostics: high-definition colonoscopy, endoscopic mucosal resection, CT/MRI staging, and molecular profiling to guide targeted and immunotherapies.
- Personalized care pathway: from risk assessment and screening to treatment and long-term survivorship support.
If you have persistent bowel changes or rectal bleeding—or you are due for screening—book an appointment with MedicalPoint’s Gastroenterology or General Surgery teams.
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Medical Oncology
Medical Oncology is a department that conducts studies on early diagnosis, cancer screening, cancer prevention and treatment of cancer patients.
After the examination of patients who apply to our hospital with their complaints, blood tests, ultrasonography, MRI, PET, CT and if necessary biopsy are performed to ensure a correct diagnosis.
