Sleep apnea syndrome (SAS) is a group of syndromes characterized by repeated pauses in breathing during sleep, ≥10 seconds per pause, usually >20 pauses per hour, and laboratory tests that measure a decrease in blood oxygenation. Snoring (partially obstructed breathing during sleep) is a very common occurrence and only in rare cases suggests sleep apnea. Snoring is more common in obese people, three times more common than in normal people; in mild cases, it disturbs the peace of others, and in severe cases, it suggests obstructive apnea. Alcoholic beverages, psychostimulants, hypnotics and antihistamines can aggravate snoring. Detailed examination of nasal cavity, oral cavity, soft palate, throat and neck should be done for severe snoring. In China, the prevalence of obstructive sleep apnea syndrome (OSAS) with snoring as the main symptom is 4%, and the prevalence of people over 65 years old is as high as 20% to 40%. The ultimate evil of sleep apnea syndrome (SAS) is to suffer from cardiovascular disease, which has become the first cause of death in the world. The above figures remind clinicians that sleep disorders have become a common disease and should be actively diagnosed and treated.