Snoring is a loud, hoarse, or harsh breathing sound that occurs during sleep.

Snoring is common in adults and is not necessarily a sign of an underlying disorder.

Sometimes, however, snoring can be a sign of a sleep disorder called sleep apnea. This means you have periods when you completely or partly stop breathing for more than 10 seconds while you sleep. The episode is followed by a sudden snort or gasp when breathing resumes. Then, snoring starts all over again. If you have sleep apnea, this cycle generally happens multiple times a night. Sleep apnea is not as common as snoring.

Hypopneas are episodes in which the airway becomes partially blocked. They are not as severe as apneas, but can contribute to the overall airway blockage.

A doctor (or a sleep specialist) can tell if you have sleep apnea by doing a sleep study either at home or in a hospital setting.

Snoring is an important social problem. Persons who share a bed with a someone who snores can develop sleep difficulties.

In most people, the reason for snoring is not known. Some potential causes (other than sleep apnea) include:

• Being overweight, which leads to excessive neck tissue that puts pressure on the airways
• Last month of pregnancy
• Nasal congestion from colds or allergies, especially if it lasts a long time
• Swelling of the muscular part of the roof of the mouth (soft palate) or uvula, the piece of tissue that hangs down in the back of the mouth
• Swollen adenoids and tonsils that block the airways
• Use of sleeping pills, antihistamines, or alcohol at bedtime
• Prominence of the area at the base of the tongue

See obstructive sleep apnea for more causes.