“Causes
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:
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Inflammation or other problems with the blood vessels in and around the brain, including stroke
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Infections, such as meningitis
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Intracranial pressure that's either too high or too low
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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.
Risk factors
By Mayo Clinic Staff
Factors associated with developing frequent headaches include:
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Female sex
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Anxiety
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Depression
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Sleep disturbances
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Obesity
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Snoring
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Overuse of caffeine
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Overuse of headache medication
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Other chronic pain conditions
Complications
If you have chronic daily headaches, you're also more likely to have depression, anxiety, sleep disturbances, and other psychological and physical problems.”
http://coloradopain.co/pain-conditions/head-and-neck/headaches/
