Factors that may trigger a headache are stress, lack of sleep, dehydration, certain foods, alcohol, caffeine, medication overuse, excessive sound, weather changes and hormonal changes.

Seriousness of the headache depends upon the underlying cause of the headache. Sometimes, a headache can be a symptom of serious conditions like brain tumour, infections, migraine, vascular disorders and hemorrhage.

Primary headache includes migraine. Secondary causes include
- Head trauma
- Vascular disorders
- Brain hemorrhage
- Brain tumour
- Infection, meningitis
- Glaucoma
- Post-ictal headache
- Gastrointestinal disorders
- Hypertension
- Medication overuse

Migraine can be treated by medications like non-steroidal anti-inflammatory drugs like ibuprofen, and triptans. Treating the underlying cause is important like infections, glaucoma, or hypertension.

Headache is a condition in which there is pain in any region around the head due to one or more of many causes. Migraine is a type of headache in which there is severe headache that can occur with aura and accompanying symptoms like nausea, vomiting and sensitivity to light. Migraines can last from 4 hours to 3 days.