title: [Substance P and pain: possible pathogenic role in chronic primary headache].
mesh_terms: D002908:Chronic Disease; D006261:Headache / Q000503:physiopathology*; D006801:Humans; D010146:Pain / Q000503:physiopathology*; D013373:Substance P / Q000502:physiology*
chemical_list: D013373:Substance P
vernacular_title: Sostanza P e dolore: possibile ruolo patogenetico nella cefalea primaria cronica.