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: 
Chronic migraine
Chronic tension-type headache
New daily persistent headache
Hemicrania continua
 Chronic migraine This type typically occurs in people with a history of episodic migraines. Chronic migraines tend to: 
Affect one side or both sides of your head
Have a pulsating, throbbing sensation
Cause moderate to severe pain
 And they cause at least one of the following: 
Nausea, vomiting or both
Sensitivity to light and sound
 Chronic tension-type headache These headaches tend to: 
Affect both sides of your head
Cause mild to moderate pain
Cause pain that feels pressing or tightening, but not pulsating
 New daily persistent headache These headaches come on suddenly, usually in people without a headache history. They become constant within three days of your first headache. They: 
Often affect both sides of your head
Cause pain that feels like pressing or tightening, but not pulsating
Cause mild to moderate pain
Might have features of chronic migraine or chronic tension-type headache
 Hemicrania continua These headaches: 
Affect only one side of your head
Are daily and continuous with no pain-free periods
Cause moderate pain with spikes of severe pain
Respond to the prescription pain reliever indomethacin (Indocin)
Can become severe with development of migraine-like symptoms
 In addition, hemicrania continua headaches are associated with at least one of the following: 
Tearing or redness of the eye on the affected side
Nasal congestion or runny nose
Drooping eyelid or pupil narrowing
Sensation of restlessness
