Obstructive sleep apnea (OSA) is a major public health problem in both developed and developing countries. It commonly causes fatigue, excessive daytime sleepiness, poor night-time sleep, depression, poor memory, and loss of concentration. It also has long-term complications including uncontrolled hypertension, atrial fibrillation, heart attack, stroke, and congestive heart failure. OSA also increases the risk of traffic accidents. The importance and awareness of this disease is low among both the general population and physicians. There are many misconceptions about this disease and various treatment options available which cause delays in the diagnosis and treatment of OSA. This paper will discuss the signs and symptoms of obstructive sleep apnea, its potential complications and how to diagnose and treat this condition.