5 Possible Causes Parents Should Know — and What to Do About Each One
By Dr. Mandeep Johal, DMD | Family Dental Centre / Tongue & Lip Tie Centre | Canada | @drmandeepjohal
Snoring Is Not Just Noise
You stand at the door of your child’s room and listen. There it is again — that raspy, rattling sound you’ve been hearing every night. You tell yourself it’s probably nothing. Lots of kids snore, right?
Some do, temporarily — during a cold, when congestion is high. But regular, nightly snoring in a child is not normal. It is a sign that something in the airway is working harder than it should.
What Disrupted Sleep From Snoring Can Look Like During the Day
- Difficulty waking in the morning despite adequate hours
- Moodiness, irritability, or emotional outbursts
- Hyperactivity or difficulty concentrating at school
- Fatigue or low energy through the day
- Dark circles under the eyes
- Bed wetting past the expected age
- Frequent illness — the immune system never fully consolidates
- Anxiety or heightened stress response
These aren’t character traits or parenting challenges. They are symptoms. And when the snoring is addressed, they very often resolve alongside it.’
The 5 Most Common Causes of Snoring in Children
These causes are not mutually exclusive. Many children have more than one at play.
Cause 1: Enlarged Tonsils and Adenoids
Tonsils and adenoids can become chronically enlarged from repeated infections, allergies, or natural variation. When enlarged, they physically narrow the upper airway, making breathing during sleep effortful and noisy. This is one of the most common causes of snoring in children aged 2–10.
Important note: For some children, snoring and disrupted sleep continue after surgery. A narrow palate, low tongue posture, or established breathing habits may all be contributing alongside enlarged tonsils.
Signs to look for:
- Loud snoring that is consistent, not just during illness
- Open mouth breathing during sleep and at rest
- A noticeably enlarged or reddened throat
- Frequent throat infections or tonsillitis
- Sleep that looks effortful
What to do: Ask your GP for a referral to an ENT specialist. If surgery is recommended, consider also scheduling a myofunctional therapy evaluation before and after.
Cause 2: A Narrow Jaw or High Palate
When the upper jaw is narrow, the nasal floor is narrow too. Less air moves through with each breath. The child compensates by breathing through the mouth, which allows the soft tissues of the throat to collapse inward during sleep.
Narrow palates are increasingly common, driven largely by soft food diets, prolonged bottle and pacifier use, mouth breathing, and tongue tie. While the mid-palatal suture is still open — generally until the mid-teens — the jaw can be gently widened.
Signs to look for:
- A high, vaulted palate
- Crowded or overlapping teeth, or very little spacing between baby teeth
- Mouth breathing at rest and during sleep
- A narrow face and dental arch
- Crossbite
What to do: Seek an assessment from an airway-focused orthodontist or dentist who evaluates jaw width and nasal airflow together.
Cause 3: Tongue Tie and Low Tongue Posture
The tongue has a job to do during sleep: rest flat against the roof of the mouth, holding the jaw forward and preventing the soft tissues of the throat from collapsing. When a tongue tie prevents this position, the tongue drops, the jaw falls back, the throat narrows, and snoring results.
Signs to look for:
- Tongue cannot lift to the roof of the mouth easily
- Visible tight band under the tongue
- Heart-shaped or notched tongue when stuck out
- History of breastfeeding difficulties or speech concerns
What to do: Ask for a tongue tie assessment from a provider trained in functional frenulum evaluation — not just visual inspection.
Cause 4: Allergies and Chronic Nasal Congestion
Allergic rhinitis — inflammation of the nasal lining from allergens like dust, mould, pollen, or pet dander — is one of the most common causes of childhood nasal obstruction. A child with undiagnosed allergic rhinitis may snore regularly and always seem slightly congested without being visibly unwell.
Signs to look for:
- Snoring that worsens at certain times of year or in certain environments
- Persistent nasal congestion without a clear illness
- Frequent eye or nose rubbing
- Dark circles under the eyes
What to do: Speak with your GP about allergy testing and management. Nasal saline rinses at bedtime can reduce congestion significantly.
Cause 5: Mouth Breathing as an Established Habit
Sometimes the structural causes have been partially resolved — the tonsils were removed, the allergies are managed — but the snoring continues. Mouth breathing, once established as the body’s default pattern, does not simply stop when the physical barrier is removed. The muscles and nervous system have learned a pattern.
Signs to look for:
- Persistent mouth breathing and snoring despite previous treatment
- Open mouth posture during the day
- Tongue resting low rather than at the roof of the mouth
- No clear structural reason remaining for the snoring
What to do: Myofunctional therapy is the primary treatment for habitual mouth breathing.
When to Seek Help Urgently
Questions Parents Ask Most Often
Is it normal for toddlers and young children to snore?
Occasional snoring during a cold is common. But regular, nightly snoring — snoring that happens most nights regardless of illness — is not normal. Any consistent snoring in a child deserves assessment, including in toddlers.
My child snores but sleeps through the night. Does it still matter?
Yes. Children rarely wake fully from micro-arousals caused by snoring. The impact on sleep quality, growth hormone release, immune function, and behavioural regulation is real, even without visible night waking.
We’ve already had the tonsils and adenoids out and the snoring hasn’t stopped. What now?
Surgery removes one cause, but if other factors were also present, they continue to drive the snoring after the tonsils are gone. A comprehensive reassessment is the next step.
Can snoring affect my child’s behaviour and school performance?
Absolutely. Many children who carry diagnoses of ADHD or behavioural difficulties have unidentified sleep-disordered breathing as a contributing or primary factor. Treating the airway does not always resolve the behavioural picture completely, but in many children, the improvement is significant and rapid.
