What Causes Snoring? Reasons, Risk Factors & Remedies

What is snoring?

Snoring is the coarse sound produced when relaxed tissues in the upper airway vibrate against turbulent airflow during sleep. The soft palate, uvula, tongue base, and pharyngeal walls are the usual culprits. The louder and more habitual the snoring, the more obstructed the airway — and the higher the chance it overlaps with obstructive sleep apnea.

Snoring is the symptom; the cause is always some form of narrowing. Almost every regular snorer has two or three of the causes below stacked together.

Anatomical causes

Some people are simply built to snore. The following features reduce the cross-section of the upper airway and increase tissue vibration:

• Long soft palate or elongated uvula — extra tissue dangling into the airway.
• Enlarged tonsils or adenoids — a common driver of snoring in children.
• Recessed or compact lower jaw (retrognathia) — pushes the tongue base back into the throat.
• Deviated septum or nasal polyps — chronic nasal-side obstruction.
• Large tongue (macroglossia) — falls back during sleep, especially when lying on the back.

Anatomical contributors are usually lifelong rather than sudden. A mandibular advancement device or tongue stabiliser is often the most effective first-line treatment when anatomy is the dominant factor.

Weight and neck size

Carrying extra weight — particularly around the neck — narrows the airway and increases tissue collapse during sleep. The risk thresholds widely cited in sleep medicine:

• Men: collar size above 16.5 inches (42 cm).
• Women: collar size above 16 inches (40.5 cm).

A 5–10% reduction in body weight is enough to meaningfully reduce snoring severity in most people. See our dedicated guide on weight and snoring for the full mechanism.

Nasal and sinus problems

Anything that blocks the nose forces mouth breathing, which dries the throat and amplifies tissue vibration. The main causes:

• Allergic rhinitis (hay fever, dust mites, pet dander)
• Sinusitis and chronic congestion
• Deviated septum and nasal polyps
• Common cold or post-viral congestion
• Dry bedroom air

A chronically blocked nose is one of the most treatable causes of snoring — often resolved with saline rinses, nasal strips, an antihistamine, or a humidifier.

Poor muscle tone in the throat and tongue

When the muscles of the throat and tongue relax too much during sleep, they collapse into the airway. This is exaggerated by deep sleep, sedative medications, alcohol, and natural ageing.

Muscle tone in the soft palate and pharynx declines from middle age onward, which is why snoring becomes more common, louder, and more medically significant as we get older. Oropharyngeal exercises (singing, didgeridoo practice, tongue strengthening drills) have been shown to reduce snoring intensity by up to 59% over three months.

What causes snoring in women

Before menopause, around 24% of women snore regularly. After menopause, that rate climbs sharply and approaches the male rate. The drivers specific to women:

• Menopause — declining oestrogen reduces upper-airway muscle tone.
• Pregnancy — weight gain, hormonal upheaval, and swollen nasal mucosa cause new-onset snoring in around one in three women in the third trimester. See snoring during pregnancy.
• Hypothyroidism — more common in women and associated with airway tissue thickening.
• Iron-deficiency anaemia — can worsen sleep fragmentation and breathing.

What causes snoring in men

Roughly 40% of adult men snore habitually. Three structural reasons dominate:

• Men have longer, narrower airways than women.
• Fat is more readily deposited around the neck and abdomen.
• Testosterone is associated with reduced upper-airway muscle tone during sleep.

Higher rates of alcohol use, smoking, and untreated nasal obstruction in men compound the anatomical disadvantage.

Lifestyle triggers (the fixable ones)

Alcohol and sedatives

Alcohol decreases the resting tone of throat muscles for several hours. Drinking within 3–4 hours of bedtime significantly worsens snoring. Sedative medications, sleeping pills, opioids, and some antihistamines have the same effect. See alcohol's impact on snoring.

Smoking

Cigarette smoke causes chronic inflammation in the upper-airway tissues, restricting airflow and increasing mucus. Smokers are also at elevated risk of obstructive sleep apnea. Read how smoking affects snoring.

Sleep position

Sleeping on your back lets gravity pull the tongue and soft palate backward. Side sleeping is one of the simplest, free interventions you can try tonight.

Stress and fatigue

Severe fatigue deepens sleep and over-relaxes airway muscles, producing louder snoring than usual. Stress-induced snoring is real and often resolves with better sleep hygiene.

Dry bedroom air

Low humidity dries the airway tissues and increases vibration. A bedroom humidifier kept at 40–60% relative humidity can noticeably reduce snoring in winter months.

Why did I suddenly start snoring?

Sudden-onset snoring almost always has a clear trigger. Run through this checklist:

• Have you gained 3 kg or more in the last few months?
• Started a new medication — especially a sedative, muscle relaxant, opioid, or antihistamine?
• Have you had a recent cold, sinus infection, or hay-fever flare?
• Are you drinking more alcohol than usual in the evenings?
• Are you pregnant?
• Have you had a head, neck, or jaw injury?

Sudden, loud snoring after a head or neck injury, or that wakes you with gasping, warrants an urgent GP appointment.

Risk factor table at a glance

When snoring signals something serious

Occasional snoring is usually harmless. Loud, persistent snoring with any of the following warrants a GP visit and likely a sleep study:

• Witnessed breathing pauses, gasping or choking during sleep
• Excessive daytime sleepiness or falling asleep at the wheel
• Morning headaches
• Difficulty concentrating or memory problems
• High blood pressure that's hard to control

See the full comparison in snoring vs sleep apnea, or read about what a sleep study involves.

Remedies and treatments

Lifestyle changes (first line)

Weight loss, cutting alcohol in the evening, quitting smoking, treating nasal congestion, and side-sleeping should be tried before any device. Our full how to stop snoring guide walks through each one.

Anti-snoring devices

Mandibular advancement devices (MADs) reposition the jaw to open the airway. Tongue stabilising devices (TSDs) hold the tongue forward. Nasal dilators and strips improve nasal airflow. Sprays moisten and reduce tissue vibration. See our anti-snoring devices hub for the full comparison.

Medical treatments

For severe snoring or sleep apnea, CPAP therapy, custom dental appliances, or surgical procedures may be recommended. Always consult a healthcare provider before pursuing surgery.