Sleep grunting may be the emergence of sinusitis, tonsillitis, sleep apnea syndrome and other problems. 1. Sinusitis: viral or bacterial infections and other pathogenic microorganisms can lead to inflammation of the sinus tissue, so that the sinus mucosa congestion and edema produce inflammatory secretions, which can cause the nose ventilation is not smooth, leading to sleep with a humming sound. 2. Tonsillitis: localized inflammation of the tonsils will lead to the narrowing of the human airway and cause breathing problems, which will cause a humming sound when sleeping. 3. Sleep apnea syndrome: when the human body sleeps due to the nervous system on the upper airway muscle regulation function is reduced, will make the airway partially collapsed, resulting in reduced ventilation, so that the inhalation of airflow in the upper airway to form a vortex, and on the soft tissue of the upper airway impact and vibration, resulting in the issuance of a grunting sound. If the grunting occurs repeatedly during sleep, then immediate medical treatment should be sought in the hospital.