In the clinical management of sinusitis, consideration should be given to the etiology of the disease, which today can be classified as infection, allergy and vasomotor conditions and local and general immunity deficiency. It is important to mention that infection can be present with an allergy, as well as with immunity deficiency. Knowledge of this differentiation is necessary for providing more effective and longer lasting conservative treatment. Surgical interventions are kept at a minimum and used only for derisation and drainage of sinuses, while preserving the mucosa.