Pollinosis is an extremely common disorder affecting between 10 to 30% of the population. There are regional and seasonal variations with allergies occurring between february (in south of France) and autumn. Pollen calenders allow one to identify the pollens specific to each region. Treatment is based on the utilisation of antihistaminic and local antiinflammatory agents. Specific desensitization is efficacious when quality extracts are used, but should be reversed for particular cases as the therapeutic risk should in no case exceed that of the illness.