VHOSPITAL.CLINIC · Medical Q&A

What Causes Headache?

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

What It Means

Headache 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 headache
  • Inflammatory/autoimmune: the body's immune response producing headache as a bystander effect
  • Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
  • Structural/mechanical: nerve compression, joint damage, or organ enlargement
  • Underlying conditions: Hypertension, Sinusitis, Ear Infection, Anemia are among the leading identifiable causes

Red Flags — When to Act

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

What to Do Now

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

When to See a Doctor

  • Headache 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 headache?

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

Can medications cause headache?

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

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

Related Resources

Possible Causes

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

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Medical ReviewvHospital Editorial Team · 2024–2025
Sources:WHOPubMedUpToDateNICE