When Should Constipation Become a Concern? Insights from Dr Vivek Mangla, Senior GI & Colorectal Surgeon

31 Mar, 2026

Constipation is a very common complaint today affecting people of all ages. This is often related to and attributed to sedentary lifestyles, low-fibre diets, stress, and dehydration. Most cases are benign and can be managed with simple diet or lifestyle adjustments. However, in certain situations, persistent constipation can indicate underlying conditions that require medical evaluation, including colorectal and rectal cancers.

Dr Vivek Mangla, Principle Director and Head of Gastrointestinal (GI) and Hepatopancreatobiliary (HPB) Surgical Oncology at Max Super Speciality Hospital Patparganj, explains how changes in bowel habits should be taken seriously when they persist or are accompanied by other concerning symptoms.

Understanding Constipation: Common but Sometimes Serious

Constipation typically refers to infrequent, hard, or difficult bowel movements. Occasional constipation is often related to:

Low dietary fibre intake
Insufficient fluid consumption
Lack of physical activity
Certain medications

These causes are common in everyday life and usually respond to dietary changes, increased fluids, and moderate exercise. However, when constipation is persistent or accompanied by other symptoms, it may signal something more serious.

3 Red Flag Symptoms You Shouldn’t Ignore

As a specialist who evaluates patients with both benign digestive issues and GI malignancies, Dr Mangla emphasizes the importance of recognizing red flag symptoms that warrant prompt medical attention.

1. Persistent or Worsening Constipation

If constipation continues for several weeks to months without relief or progressively gets worse—particularly in adults over 40—it should prompt a thorough evaluation. A long-standing change in bowel habits, especially one that doesn’t improve with lifestyle adjustments, could represent early changes associated with disorders of the colon, including cancer.

Persistent constipation should never be dismissed as “normal” simply because it is common.

2. Blood in Stools

Not all rectal bleeding is due to piles (haemorrhoids). Repeated or unexplained blood in stool—whether bright red or dark—deserves clinical assessment. This symptom can be linked to colorectal cancers or precancerous conditions, and early testing can make all the difference for timely diagnosis and treatment.

Blood in the stool combined with constipation is especially concerning and requires evaluation with colonoscopy and clinical examination.

3. Associated Symptoms: Bloating, Vomiting, Weight Loss

Constipation accompanied by systemic or abdominal symptoms such as:

Persistent bloating or distension
Unintentional weight loss
Loss of appetite
Nausea or vomiting

These signs may indicate an obstructive or malignant process within the bowel. Such combinations should prompt urgent medical assessment rather than home remedies.

Constipation and Colorectal Cancer: What the Research Shows

Colorectal cancer (cancer of the colon or rectum) can develop gradually over time and is associated with alterations in bowel habits. A change in stool frequency, stool calibre, or onset of constipation moreso after the age of 40 may be an early indication of this disease.Changes in bowel habits, including constipation, can be among the earliest symptoms of colorectal malignancies.

Early detection through screening and prompt investigation (colonoscopy) often enures timely diagnosis thereby allowing for treatment when the disease is most curable.

Making Sense of Constipation: When Is It Still “Normal”?

Not all constipation is serious. Many individuals experience mild, occasional symptoms related to diet or transient lifestyle factors. However, Dr Mangla underscores that constipation combined with red flag symptoms should not be ignored.

It’s especially important for individuals with risk factors to seek evaluation:

Age above 45–50 years
Family history of colorectal cancer
History of inflammatory bowel disease (IBD)
Sudden unexplained changes in bowel habits

What to Expect During Evaluation

If constipation symptoms are concerning, a gastro or colorectal specialist will usually recommend:

Detailed clinical history and physical examination
Blood tests and stool studies
Colonoscopy to visualise the interior of the colon
Imaging, if needed, to assess abdominal structures

These investigations help differentiate between harmless causes and conditions requiring early intervention.

Prevention, Screening, and Awareness

Colorectal cancer is among the most preventable and treatable cancers when detected early. Dr Mangla emphasizes the role of screening and awareness in preventing advanced disease. Regular check-ups, especially after the age of 40, and reporting any persistent bowel changes to a specialist can significantly improve outcomes.

Final Thoughts

While constipation is generally common and benign, persistent constipation with warning signs should never be ignored. Recognising red flags such as frequent blood in stool, systemic symptoms like weight loss, and ongoing abdominal discomfort can encourage early evaluation and potentially lifesaving interventions.

If you are concerned about chronic constipation or other gastrointestinal symptoms, consult a gastroenterologist or colorectal surgeon for personalised care and timely diagnosis.

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