By definition, chronic daily headaches occur 15 days or more a month, for longer than three months. True (primary) chronic daily headaches aren’t caused by another condition.
There are short-lasting and long-lasting chronic daily headaches. Long-lasting headaches last more than four hours. They include:
Occasional headaches are common, and usually require no medical attention. However, consult your doctor if:
Seek prompt medical care if your headache: