The causes of many chronic daily headaches aren't well understood. True (primary) chronic daily headaches don't have an identifiable underlying cause. Some possible factors may include:
- You've developed a heightened response to pain signals.
- The part of your brain that suppresses pain signals isn't working properly.
Other frequent headaches may be caused by various underlying diseases or conditions
,including:
- 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
Many people who have frequent headaches are actually experiencing a rebound effect from taking pain medication too often. If you're taking pain medications — even over-the-counter analgesics — more than three days a week (or nine days a month), you're at risk of developing rebound headaches
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