a moderate-severe headache that starts a few hours after falling asleep and lasts 15-30 minutes. The headache may recur several times during the night. Hypnic headaches are usually in older women. They may be treated with lithium.

Secondary

Headaches may be caused by problems elsewhere in the head or neck. Some of these are not harmful, such as cervicogenic headache (pain arising from the neck muscles). The excessive use of painkillers

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