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Snoring is a raspy noise produced in the nose and throat during sleep. It is quite common and becomes more common as people age. About 57% of men and 40% of women snore. However, what qualifies as snoring depends on the person listening to it, and how loudly and how much a person snores vary from night to night. Thus, the percentage of people who snore is only an estimate.
A few people snore quietly, but snoring is usually noticeable and is sometimes loud enough to be heard in another room. Snoring is distressing only to other people, typically a bed partner or roommate trying to sleep. People seldom know that they snore unless others tell them.
Snoring can have significant social consequences. It frequently causes stress between the snorer and bed partner or roommates. Snorers have been assaulted and rarely even murdered because of their snoring.
Other symptoms such as waking up frequently, gasping or choking during sleep, excessive daytime sleepiness, and morning headache may also be present, depending on what is causing the snoring.
Snoring results from fluttering of soft tissues in the nose and throat, particularly the soft palate (the back part of the roof of the mouth). The fact that people do not snore when they are awake suggests that relaxation of muscles during sleep is the cause. This relaxation is thought to decrease the stiffness of tissue, making it more likely to flutter (just as a cloth flag is more likely to flutter in a breeze than a similar-sized sheet of metal). Also, tissue relaxation probably narrows parts of the upper airway, making flutter more likely.
Primary snoring is snoring that does not cause people to wake up more often than normal during the night. During sleep, the amount of airflow into the lungs and oxygen level in the blood are normal. Because these factors are normal, people do not have excessive daytime sleepiness.
Snoring is often a symptom of sleep-disordered breathing. Sleep-disordered breathing ranges from upper airway resistance syndrome to obstructive sleep apnea (OSA—see Sleep Apnea). These forms differ mainly in how much of the airway is blocked (degree of airway obstruction) and what the effects of the blockage are. The effects involve mainly disturbances of sleep and/or airflow.
People with OSA stop breathing briefly more than 5 times per hour during sleep and have one or more of the following:
People with upper airway resistance syndrome have excessive daytime sleepiness or other symptoms but do not have all the features required for doctors to diagnose OSA.
Risk factors for snoring include
Snoring also appears to run in families.
For doctors, the main goal is identifying people who are at high risk of OSA. Most people who snore do not have OSA. However, most people with OSA do snore.
People with warning signs should see a doctor at some point because testing may be needed. Timing of the appointment is not critical and can be when mutually convenient.
People without warning signs are unlikely to need testing and may wish to try general measures to help reduce snoring before they call a doctor. If these measures are unsuccessful and snoring is very bothersome to their bed partner, people should see their doctor.
Doctors first ask questions about the snoring and other symptoms and then about the person's other medical history. Because several important findings are noticed mainly by others, doctors try to interview the bed partner or roommates when possible. Doctors then do a physical examination. What they find during the history and physical examination helps them decide whether tests for OSA need to be done.
Doctors ask how severe the snoring is. For example, they may ask the bed partner
The person and bed partner are also asked to describe
Doctors also ask about disorders that may be associated with OSA, particularly high blood pressure, heart disorders, stroke, acid reflux, atrial fibrillation (an abnormal heart rhythm), depression, and diabetes. They ask about the amount of alcohol the person drinks, including how close to bedtime the person drinks it. Whether the person takes any sedating or muscle-relaxing drugs is also important.
During the physical examination, doctors measure the person's height and weight in order to calculate body mass index (BMI—see Evaluation of Nutritional Status). The higher the person's BMI, the greater the risk of OSA. Doctors may measure the neck. OSA is more likely when the neck is larger than about 16 inches for women and about 17 inches for men.
Doctors also inspect the nose and mouth for signs of airway obstruction and risk factors for snoring—for example, nasal polyps, chronic nasal congestion, a high and arched palate, a jaw that is small or farther back than normal, and an enlarged tongue, tonsils, or uvula (the structure that hangs down at the back of the throat). Doctors measure blood pressure because OSA is more likely when blood pressure is high.
Although doctors are not able to predict risk precisely, the more risk factors and warning signs people have, the greater their risk of OSA.
When doctors suspect OSA, they typically do tests to confirm the diagnosis.
Testing consists of polysomnography (see Sleep Disorders:Testing). For this test, people sleep overnight in a laboratory while their breathing and other functions are monitored. However, because snoring is so common and polysomnography is costly and time-consuming, polysomnography is usually done only when doctors strongly suspect OSA. Thus, they typically test only people who have warning signs (particularly those with episodes of not breathing witnessed by another person and those with several risk factors).
If people without warning signs do not appear to have any sleep disturbance other than snoring, they typically do not need tests. However, they should schedule regular follow-ups so that their doctor can check for the development of such problems.
Several general measures may help reduce primary snoring. None are effective in everyone, but some people may benefit. Measures include
The best way to elevate the head is to put blocks under two of the bed's legs to raise the head of the bed or to use a wedge pillow that slants the whole upper body. People should not use pillows to raise only the head.
Oral appliances are worn only during sleep. They include mandibular advancement splints and tongue-retaining devices. These appliances, which must be fitted by specially trained dentists, can help keep the airway open during sleep in people with mild to moderate OSA and may help reduce snoring.
Mandibular advancement splints are small plastic devices that fit in the mouth like a mouth guard or orthodontic retainer. They push the lower jaw (mandible) and tongue forward and thus help keep the airway open during sleep. Some of these devices can be adjusted in small increments to ensure the best results. Adjustable devices are more effective than those that cannot be adjusted.
Tongue-retaining devices use suction to keep the tongue forward. If the tongue moves back in the mouth, it can block the airway. These devices are more uncomfortable and probably less effective than mandibular advancement devices.
Oral appliances may be used alone or with other treatments for sleep-related breathing disorders, such as weight management, surgery, or continuous positive airway pressure. Oral appliances can cause discomfort and excess salivation, and teeth may be pushed out of alignment. But most people tolerate them well.
With CPAP, people breathe through a small mask applied to the nose or to the nose and mouth. The mask is attached to a device that supplies air at a pressure that helps prevent the airway from narrowing or collapsing when people breathe in (which is when most snoring occurs). CPAP provides very effective relief of OSA and helps reduce snoring. However, many people find CPAP devices uncomfortable and inconvenient. People with OSA tend to be more motivated to use CPAP than those whose only problem is snoring because untreated OSA can cause significant symptoms and increase the risk of serious disorders.
Some airway obstructions that contribute to snoring, such as nasal polyps, enlarged tonsils, and a deviated septum, can be treated surgically. But whether and how well such procedures reduce snoring have not been proved.
In addition, a number of surgical procedures have been developed specifically to treat OSA, and some can help reduce snoring. These procedures reshape tissues of the palate and/or uvula or stiffen the palate using implants or injections. They include uvulopalatopharyngoplasty, laser-assisted uvuloplasty, injection snoreplasty, radiofrequency ablation, and palatal implants.
In uvulopalatopharyngoplasty , tissues of the palate and uvula are surgically reshaped. Excess tissue is removed, and the airway is widened. This procedure requires a general anesthetic and a stay in the hospital. It can reduce snoring, but its effects may last only a few years.
For laser-assisted uvuloplasty , a laser or high-energy microwave device is used to reshape tissue, so this procedure is less invasive than uvulopalatopharyngoplasty. However, whether it can reduce snoring has not been proved, although some people seem to benefit from it.
For injection snoreplasty (a form of sclerotherapy), a substance that irritates the tissues and causes fibrous scar tissue to form is injected into the soft palate. As a result, the soft palate and uvula become stiffer and less likely to vibrate. Whether this procedure can reduce snoring requires further study.
For radiofrequency ablation , a probe is used to deliver heat (from an electrical current) into the soft palate. This procedure shrinks and stiffens tissues. It can reduce snoring, but further study is needed.
Palatal implants , made of polyethylene, can be placed into the soft palate to stiffen it. Three small implants are used. Whether these implants are useful for snoring alone has not been proved.
Only a few people who snore have OSA, but most people who have OSA snore.
Warning signs, such as episodes of not breathing or of choking during sleep, daytime sleepiness, and obesity, help identify people at risk of OSA and thus in need of testing with polysomnography.
General measures to reduce snoring include avoiding alcohol and sedating drugs before bedtime, sleeping with the head elevated, losing weight, and, for the bed partner, using earplugs and having alternative sleeping arrangements.
Specific treatments include CPAP, mandibular advancement devices, and surgery.
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