Some snoring is explained by nasal congestion or enlarged tonsils or adnoids. An important condition that may be associated with snoring is Obstructive Sleep Apnea when there is obstruction to airflow due to collapse of the walls of the pharynx (throat) during sleep. Obstructive Sleep Apnea (OSA) may already be present or develop in snorers especially with weight gain. Increasing age, male sex, smoking, hereditary factors, cranial abnormalities and diabetes are some risk factors of OSA. This condition is suspected in snorers who complain of daytime fatigue or poor concentration. OSA may affect as many as 15 million adults. 2-9% of the population may have symptoms attributable to OSA.