title: Tension-type and chronic daily headache.
authors.affiliation: Temple University School of Medicine, Germantown Hospital and Medical Center, Philadelphia, PA.
authors.forename: S D
authors.initials: SD
authors.lastname: Silberstein
mesh_terms: D002908:Chronic Disease; D004723:Endorphins / Q000134:cerebrospinal fluid; D005260:Female; D006261:Headache / Q000134:cerebrospinal fluid / Q000145:classification / Q000188:drug therapy / Q000209:etiology / Q000503:physiopathology; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000209:etiology / Q000503:physiopathology; D009119:Muscle Contraction; D019966:Substance-Related Disorders / Q000150:complications
chemical_list: D004723:Endorphins