Obstructive sleep apnea syndrome (OSAS) is a sleep breathing disorder characterized by repeated episodes of obstruction of the upper airways during sleep, usually associated with a reduction oxygen saturation of the blood. Snoring and excessive daytime sleepiness are considered themost importantsymptoms ofOSAS.Due to its possible consequences, particularly those affecting the respiratory and cardiovascular systems, the disorder is associated with significant morbidity and mortality. This article gives a brief on review causes, clinical features, evaluation, and therapy of OSAS. As more physicians become familiar with the clinical presentation of OSAS, the number of patients diagnosed with this disorder will increase. This should lead to appropriate treatment and a decrease in the mortality rates associated with this disorder.

        Key words: obstructive sleep apnea syndrome, evaluation, treatment.