VHOSPITAL.CLINIC · Medical Q&A

What Causes Irregular heartbeat?

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

What It Means

Irregular heartbeat 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 irregular heartbeat
  • Inflammatory/autoimmune: the body's immune response producing irregular heartbeat as a bystander effect
  • Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
  • Structural/mechanical: nerve compression, joint damage, or organ enlargement
  • Underlying conditions: various medical conditions are among the leading identifiable causes

Red Flags — When to Act

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

What to Do Now

  1. 1.Keep a symptom diary: date, time, severity, triggers, and what improves or worsens irregular heartbeat
  2. 2.Review your medications — many drugs can cause irregular heartbeat 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 irregular heartbeat

When to See a Doctor

  • Irregular heartbeat 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 irregular heartbeat?

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

Can medications cause irregular heartbeat?

Yes — many medications list irregular heartbeat 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 irregular heartbeat always related to a physical cause?

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

Related Resources

Possible Causes

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

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Medical ReviewvHospital Editorial Team · 2024–2025
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