(OSA): Symptoms, Treatments, and Causes Obstructive sleep apnea (OSA) is a respiratory seizing caused by the collapse of the walls of the pharynx. The disorder mainly occurs while the person is asleep and snoring. To be more exact, during the attack, a patient stops snoring because of the blockage of the air passage through the pharynx. Repeated episodes of obstructive sleep apnea result in the lo...[Read More]