Cypress allergy or rather Cupressaceae allergy is an extraordinary observation subject and study model. Annual R.N.S.A. meeting is a good opportunity to share the analysts and sentinel doctors' point of view on this subject. For the medicine sentinel of the Nîmes's pollen site, the development of these Cupressaceae sensitivities is becoming a true public health priority. This feeling is shared by the southern sector responsible of the French network. It is absolutely necessary to develop actions.