Headaches are very common, and most are not dangerous. However, different headache patterns can point to different causes, and some symptoms need urgent medical attention. It helps to notice where the pain is, how quickly it started, how long it lasts, what it feels like and whether it comes with other symptoms. If headaches are frequent, severe, new or changing, it is always best to discuss them with a doctor. On this page Understanding headaches 1. Tension-type headache 2. Migraine 3. Cluster headache 4. Sinus headache 5. Hormonal headache 6. Caffeine withdrawal headache 7. Medication-overuse headache 8. Exertion headache 9. Eye-strain headache 10. Hypertension-related headache 11. Post-traumatic headache 12. Thunderclap headache Closing thoughts Understanding Headaches Primary and secondary headaches ...