title: Unusual headache syndromes.
abstract: OBJECTIVE
  Some headache syndromes have few cases reported in the literature. Their clinical characteristics, pathogenesis, and treatment may have not been completely defined. They may not actually be uncommon but rather under-recognized and/or underreported.
  
  
  METHODS
  A literature review of unusual headache syndromes, searching PubMed and ISI Web of Knowledge, was performed. After deciding which disorders to study, relevant publications in scientific journals, including original articles, reviews, meeting abstracts, and letters or correspondences to the editors were searched.
  
  
  RESULTS
  This paper reviewed the clinical characteristics, the pathogenesis, the diagnosis, and the treatment of five interesting and unusual headache syndromes: exploding head syndrome, red ear syndrome, neck-tongue syndrome, nummular headache, and cardiac cephalgia.
  
  
  CONCLUSIONS
  Recognizing some unusual headaches, either primary or secondary, may be a challenge for many non-headache specialist physicians. It is important to study them because the correct diagnosis may result in specific treatments that may improve the quality of life of these patients, and this can even be life saving.
authors.affiliation: Department of Neurology, Universidade Federal de Santa Catarina, Florianópolis, Brazil.
authors.forename: Luiz P
authors.initials: LP
authors.lastname: Queiroz
mesh_terms: D006261:Headache; D006801:Humans; D013577:Syndrome