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VHOSPITAL.CLINIC · Symptom Guide

Melena: Causes, Symptoms and Treatment

Black tarry stools occurs when normal physiological processes are disrupted — by infections, inflammation, metabolic changes, nerve sensitisation, or structural problems. Understanding the underlying mechanism is the first step toward effective treatment.

Updated March 27, 2026

What Causes Melena

  • 1Infections and inflammation — bacterial, viral, or autoimmune triggers activate melena
  • 2Metabolic disturbances — hormonal imbalances, nutrient deficiencies, or blood sugar changes
  • 3Structural or vascular causes — tissue damage, nerve compression, or circulatory problems
  • 4Psychological factors — stress, anxiety, and depression can produce measurable physical melena
  • 5Underlying conditions such as various medical conditions frequently present with melena as a core feature

Warning Signs — When to Seek Help

  • Sudden, severe melena that peaks within seconds to minutes
  • Black tarry stools accompanied by chest pain, shortness of breath, or neurological changes
  • Onset after trauma, head injury, or toxic exposure
  • Progressive worsening over days or weeks without a clear cause
  • Black tarry stools in a high-risk individual (age >65, immunocompromised, or pregnant)

When to See a Doctor

  • Black tarry stools is sudden, severe, or described as 'the worst you've ever experienced'
  • Associated symptoms include fever >39°C, vision changes, confusion, or weakness
  • Symptoms persist beyond 72 hours or are progressively worsening

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Medical Questions About Melena

Why Does Black tarry stools Happen?

Learn why melena occurs, its underlying mechanisms, and the most common medical causes.

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When Is Black tarry stools Dangerous?

Understand the warning signs that make melena a medical emergency requiring immediate attention.

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How to Relieve Black tarry stools

Proven methods and practical steps to relieve melena quickly and safely at home.

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What Causes Black tarry stools?

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

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Can Stress Cause Black tarry stools?

Explore how psychological stress and anxiety can directly trigger or worsen melena.

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Experiencing Melena?

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Medical References

Content on this page is informed by evidence-based clinical sources including:

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