VHOSPITAL.CLINIC · Medical Q&A

What Causes Vomiting?

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

What It Means

Vomiting 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 vomiting
  • Inflammatory/autoimmune: the body's immune response producing vomiting as a bystander effect
  • Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
  • Structural/mechanical: nerve compression, joint damage, or organ enlargement
  • Underlying conditions: Gastritis, Peptic Ulcer, Migraine, Pancreatitis are among the leading identifiable causes

Red Flags — When to Act

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

What to Do Now

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

When to See a Doctor

  • Vomiting 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 vomiting?

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

Can medications cause vomiting?

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

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

Related Resources

Possible Causes

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

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Medical ReviewvHospital Editorial Team · 2024–2025
Sources:WHOPubMedUpToDateNICE