The causes of many chronic daily headaches aren't well-understood. True (primary) chronic daily headaches don't have an identifiable underlying cause.

Conditions that may cause non-primary chronic daily headaches include:

  • Inflammation or other problems with the blood vessels in and around the brain, including stroke
  • Infections, such as meningitis
  • Intracranial pressure that's either too high or too low
  • Brain tumor
  • Traumatic brain injury

Medication overuse headache

This type of headache usually develops in people who have an episodic headache disorder, usually migraine or tension-type, and take too much pain medication. If you're taking pain medications — even over-the-counter analgesics — more than two days a week (or nine days a month), you're at risk of developing rebound headaches.

March 10, 2015

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