Headache: common causes and dangerous signs
Most headaches are not dangerous, but a sudden or unusual headache may need urgent assessment.
Common possible causes
- Tension headache and stress
- Migraine
- Dehydration, missed meals, or poor sleep
- Infection, sinus pressure, or another cause
What you can do now
- Hydrate, eat regularly, and rest
- Track triggers and duration
- Avoid frequent repeated painkiller use
- Keep a diary for recurrent headaches
When not to wait
- Sudden worst headache of your life
- Weakness, speech trouble, confusion, or fainting
- Fever with a stiff neck
- Headache after head injury or in pregnancy with high blood pressure
When to contact a clinician
Contact a clinician if symptoms worsen, last longer than expected, or you have a high-risk condition or uncertainty. Seek immediate help for warning signs.
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