A patient who has headaches as many days as not — at least 15 days per month — is said to have chronic daily headache (CDH). Not a specific type of headache, CDH is rather a descriptive term applied to any number of headache types. Headaches that can occur on a daily or near daily basis include Cluster,
Hemicrania continua, Idiopathic intracranial hypotension, Migraine and Tension headaches.