VHOSPITAL.CLINIC · Medical Q&A

What Causes Constipation?

A complete overview of all potential causes of constipation, from benign to serious medical conditions.

What It Means

Constipation has many potential causes spanning multiple organ systems. A systematic approach — considering the character, timing, triggers, and associated symptoms — helps identify the most likely cause and guides appropriate management.

Common Causes

  • Infectious causes: viral, bacterial, or fungal pathogens triggering systemic or localised constipation
  • Inflammatory/autoimmune: the body's immune response producing constipation as a bystander effect
  • Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
  • Structural/mechanical: nerve compression, joint damage, or organ enlargement
  • Underlying conditions: Hypothyroidism, Colorectal Cancer, Irritable Bowel Syndrome, Diverticulitis are among the leading identifiable causes

Red Flags — When to Act

  • Unintentional weight loss accompanying constipation (possible malignancy or metabolic disease)
  • Night sweats, fever, and constipation persisting >2 weeks
  • New constipation in someone with a known cancer, immunosuppression, or recent surgery
  • Rapid progression or change in the character of long-standing constipation
  • Family history of serious hereditary conditions presenting with constipation

What to Do Now

  1. 1.Keep a symptom diary: date, time, severity, triggers, and what improves or worsens constipation
  2. 2.Review your medications — many drugs can cause constipation as a side effect
  3. 3.Assess lifestyle factors: sleep, diet, alcohol, exercise, and hydration
  4. 4.Use our AI symptom checker to receive a structured differential and guidance
  5. 5.Book a GP appointment for persistent, recurring, or unexplained constipation

When to See a Doctor

  • Constipation persists beyond 1 week without an obvious cause
  • Severity is moderate-to-severe or worsening over time
  • Any red-flag features are present (see above)

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Frequently Asked Questions

What is the most common cause of constipation?

The most common causes of constipation in the general population are stress, dehydration, poor sleep, and minor infections. In specific populations, Hypothyroidism and other underlying conditions account for a significant proportion of cases.

Can medications cause constipation?

Yes — many medications list constipation as a potential side effect. Common culprits include antihypertensives, antibiotics, NSAIDs, and hormonal treatments. Review your medication list with a pharmacist or doctor if you suspect a drug-related cause.

Is constipation always related to a physical cause?

No. Psychological conditions such as anxiety, depression, and stress disorders frequently produce genuine physical constipation through the mind-body axis. Psychosomatic constipation is a real, measurable phenomenon requiring appropriate treatment.

Related Resources

Possible Causes

  • Infectious causes: viral, bacterial, or fungal pathogens triggering systemic or localised constipation
  • Inflammatory/autoimmune: the body's immune response producing constipation as a bystander effect
  • Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
  • Structural/mechanical: nerve compression, joint damage, or organ enlargement
constipationFull symptom guide

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Medical ReviewvHospital Editorial Team · 2024–2025
Sources:WHOPubMedUpToDateNICE