Sleep apnea syndrome, should be sleep apnea syndrome, snoring including sleep apnea syndrome and simple snoring, so sleep apnea syndrome will appear snoring symptoms, the two in the cause, symptoms and other aspects of the difference. 1. Causes (1) Sleep apnea syndrome: this disease is divided into obstructive and central. The pathogenesis of the former is the lack of airway patency. Causes include: obesity, allergic rhinitis, nasal polyps, enlarged tonsils, enlarged tongue, tongue root falling backward. The latter is due to the dysfunction of the respiratory center in the brain, which can be seen in spinal cord lesions, encephalitis, and occipital foramen magnum developmental malformation. (2) Snoring: Snoring is mainly caused by repeated collapse and obstruction of the upper airway. Such as the narrowing of nasal cavity and nasopharyngeal space, such as nasal septum deviation, adenoid hypertrophy, chronic rhinitis and so on. 2. Symptoms: Sleep apnea syndrome is obstructive and central. In the former, snoring is loud and chest and abdominal movements remain when breathing stops. In the latter case, the symptoms are mild, snoring is intermittent, and the chest and abdominal movement disappears at the same time when breathing stops. Snoring is a severe noise made with breathing during sleep and can be soft, loud, harsh, rough, hoarse or trilling. When snoring occurs, it is necessary to actively seek medical systematic examination and clear diagnosis by a specialist.