Some facts about headaches: Migraine has a prevalence between 10 and 20%. The chronology of migraine and cluster headache differs, but they are both chronic i

Some facts about headaches: Migraine has a prevalence between 10 and 20%. The chronology of migraine and cluster headache differs, but they are both chronic issues. Untreated migraine attacks last several hours and recur ususally at least once per month. ~10% of Migraine sufferer end up abusing pain killers, which increases the attack frequency and leaves them with a permanent, milder background headache. Cluster attacks last between 15 and 180 minutes (usually less than 1 hour) and recur several times per day during several weeks, then remit, only to replase later on (often at the same period of the week). Hence the name "cluster". Around 1/1000 cluster patients have "untractable chronic cluster headache", ie daily attacks without interruptions, that resist to medical treatment. (I don't remember the prevalence of drug-sensitive chronic CH).