There are many types of headaches, including: • Tension Headaches — Often triggered by stress and dehydration, tension headaches can affect anyone. • Cluster Headaches — These chronic headaches are characterized by severe burning and piercing pain that often occur behind one eye or on one side of the face at a time. • Migraine Headaches — Characterized by an intense pulsing from deep within the head, migraine headaches can last for days. • Allergy or Sinus Headaches — These secondary headaches are brought on by allergies and cause a feeling of pressure or tension in the sinuses or front of the head. • Hormone Headaches — Another type of secondary headache, these are linked to hormonal fluctuations and commonly affect women. • Caffeine Headaches — This secondary headache is caused by an abrupt cessation of caffeine, and is normally brought on when a person who normally consumes caffeine does not. • Exertion Headaches — Because these headaches are caused by periods of intense physical activity, they are also considered a secondary headache. • Hypertension Headaches — The last type of secondary headache on this list, hypertension (high blood pressure) can cause headaches, which occur when blood pressure levels become dangerously high.