Breathing and Seizures – Epilepsy: The Untold Side

Seizures and recovery

Breathing can change during and after seizures. Some changes — such as heavy, noisy or snoring breathing after a tonic-clonic seizure — can occur during normal recovery. Others, including prolonged apnoea, severe breathing difficulty, persistent cyanosis or failure to recover, are medical emergencies.

Key point: breathing changes should be judged by pattern, duration, colour, responsiveness and recovery — not by sound alone. Loud or snoring breathing can be part of postictal recovery, but trouble breathing after the seizure has stopped is a reason to call 999.

Why seizures can affect breathing

Breathing is controlled by brain networks involving the cortex, limbic system and brainstem. Seizure activity can temporarily disrupt these networks and affect breathing rate, depth, rhythm and airway tone.

A 2025 review described peri-ictal respiratory changes including central apnoea, obstructive apnoea, fast breathing, slow breathing, hypoventilation and reduced blood oxygen levels.

Breathing changes can happen during focal seizures

Respiratory changes are not limited to tonic-clonic seizures. Ictal central apnoea — a temporary pause in breathing caused by seizure activity rather than a blocked airway — has been reported particularly in focal seizures, including temporal-lobe seizures.

Importantly, a person may not always feel breathless or realise that their breathing has paused during a focal seizure.

What is ictal central apnoea?

Ictal central apnoea means breathing stops temporarily during the seizure because the brain’s respiratory drive is interrupted.

Research has found this in a substantial proportion of monitored focal seizures, especially temporal-lobe seizures. Longer pauses are more likely to produce oxygen desaturation.

This is a specialist physiological finding and cannot usually be diagnosed simply by watching from across a room.

Obstructive breathing problems can also occur

Not every breathing pause is central. The upper airway can become partly obstructed because of loss of muscle tone, body position, secretions or other factors.

This distinction matters clinically, but first aid remains focused on airway safety, normal breathing and recovery rather than trying to diagnose the mechanism at home.

What breathing can look like during a tonic-clonic seizure

During the tonic phase, chest muscles can stiffen and breathing may become temporarily impaired. During the clonic phase, breathing can remain irregular.

The person may appear pale or bluish around the lips if oxygen levels fall. Colour change should be taken seriously, particularly if it persists after the convulsive movements stop.

Heavy or snoring breathing after a tonic-clonic seizure

After a tonic-clonic seizure, breathing can sound deep, heavy, laboured or snoring. Epilepsy Action specifically notes that this can occur during the postictal phase.

This can be alarming to witnesses, but the sound alone does not necessarily mean the person has stopped breathing.

What matters is whether there is effective chest movement, improving colour and a gradual return towards the person’s normal recovery pattern.

Gasping, gulping and irregular breaths

Witnesses sometimes describe post-seizure breathing as gasping, gulping, snorting or taking deep irregular breaths. These descriptions can reflect a range of physiological changes, including recovery from hypoventilation, airway noise or irregular postictal respiration.

They should be documented objectively — for example, “three deep gasping breaths with long pauses” — rather than automatically labelled as apnoea.

If breathing is persistently abnormal, the person is not regaining consciousness, colour is poor or there are prolonged pauses, call 999.

What is post-convulsive central apnoea?

Some people have a period of central apnoea after a generalised convulsive seizure. This is called post-convulsive central apnoea.

It is of particular research interest because peri-ictal respiratory dysfunction is being investigated as one mechanism involved in SUDEP.

Breathing changes and SUDEP

Research increasingly links peri-ictal respiratory abnormalities — particularly prolonged central apnoea and severe oxygen desaturation — with SUDEP risk.

A 2025 prospective multicentre study found that longer ictal and postictal central apnoea were associated with higher SUDEP risk alongside factors such as frequent generalised convulsive seizures and living alone.

This does not mean that every episode of noisy or irregular breathing after a seizure is a near-SUDEP event. Risk assessment depends on the whole clinical picture.

Read more: SUDEP — Straight Facts →

Recovery position: when to use it

Once the convulsive movements have stopped, an unresponsive person who is breathing normally should generally be placed in the recovery position. This helps keep the airway open and allows secretions or vomit to drain.

A 2025 scoping review found no evidence that turning someone onto their side during ongoing convulsions reduces respiratory disturbance or aspiration risk, and highlighted potential injury risks. Postictally, however, lateral positioning for an unresponsive person who is breathing is advisable.

Do not put anything in the mouth

Nothing should be placed in the mouth during a seizure. A person cannot swallow their tongue, and objects placed in the mouth can damage teeth, injure the airway or cause choking.

Do not restrain the chest

Do not hold the person down or restrict chest movement during a convulsive seizure. Protect them from nearby hazards and allow the seizure to run its course unless emergency treatment is required.

Aspiration

Aspiration occurs when saliva, vomit, food or another substance enters the airway or lungs. Risk is higher when consciousness is impaired and protective airway reflexes are reduced.

Seek urgent medical assessment if, after a seizure, the person has persistent coughing, choking, breathing difficulty, chest pain, low oxygen, fever or worsening respiratory symptoms.

Vomiting after a seizure

Vomiting can occur during postictal recovery. If the person is drowsy or unresponsive, position them on their side once convulsions have stopped and monitor their breathing.

Persistent vomiting, breathing difficulty or reduced consciousness beyond the person’s usual pattern needs medical assessment.

Cyanosis: blue or grey colour

Blue, grey or dusky colour around the lips or face can indicate reduced oxygenation. Transient colour change may occur during a convulsive seizure, but persistent cyanosis after the seizure has stopped is an emergency sign.

Call 999 if colour does not improve promptly with recovery, breathing is inadequate or the person remains seriously unwell.

When breathing trouble means call 999

Call emergency services if:

the person is not breathing normally after the seizure
there are prolonged or repeated breathing pauses
breathing remains severely laboured
the person is blue, grey or markedly pale and not improving
the airway appears blocked
there is choking or suspected aspiration
they are not regaining consciousness as expected
the seizure lasts 5 minutes or more
another convulsive seizure starts before recovery

Epilepsy Action specifically advises calling an ambulance when a person has trouble breathing after the seizure has stopped.

What if the person is not breathing?

If the seizure has stopped and the person is unresponsive and not breathing normally, call 999 immediately and follow emergency-dispatcher instructions. Begin CPR if advised and if there are no signs of normal breathing.

Occasional gasps are not the same as normal breathing.

Oxygen

Supplemental oxygen is used in some healthcare settings when oxygen saturation falls, but oxygen does not treat the seizure itself and should not replace airway assessment, positioning or emergency escalation.

Home oxygen should be used only when it has been specifically prescribed and incorporated into an individual care plan.

Pulse oximeters: useful but limited

A pulse oximeter can provide additional information, but readings may be inaccurate during movement, poor circulation or immediately after a convulsive seizure.

Do not delay emergency action because a device appears to show an acceptable number when the person is visibly struggling to breathe or not recovering normally.

Nocturnal seizures and breathing

Seizures during sleep may go unwitnessed, so respiratory changes may be noticed only indirectly — for example through unusual noises, prolonged stillness or a monitoring alert.

Consumer seizure monitors can miss events and generate false alarms. They should support, not replace, an individualised safety plan.

Why video can help clinicians

If it is safe to record a seizure, video can capture breathing pattern, colour, body position and the timing of recovery. This can be useful when witnesses struggle to describe what they heard or saw.

Safety comes first: do not film instead of protecting the airway, giving prescribed rescue medication or calling emergency services.

What to record in a seizure diary

If breathing changes are part of a person’s seizures, record:

whether the change happened during or after the seizure
whether breathing stopped or only became noisy
approximate duration of any pause
colour change
snoring, gasping, gulping or choking sounds
vomiting or secretions
body position
how quickly breathing normalised
whether emergency help was needed

Put respiratory patterns into the care plan

If someone has a recognised postictal breathing pattern, their epilepsy care plan can describe what is usual and what is not.

For example, a plan might state that deep snoring breathing for a short period is usual, but persistent colour change, prolonged pauses or failure to recover requires 999.

Read more: Epilepsy Care Plans →

Do not diagnose breathing failure by sound alone

A noisy breath can still move air. A quiet person can still be breathing inadequately. Look at chest movement, colour, responsiveness and whether breathing is becoming more regular.

If you are unsure whether breathing is normal, treat that uncertainty seriously and seek emergency guidance.

The central point

Breathing changes are part of seizure semiology and postictal recovery, but they can also signal a genuine emergency.

Heavy or snoring breathing can be expected after some tonic-clonic seizures. Persistent apnoea, severe breathing difficulty, cyanosis, aspiration or failure to recover normally should never be dismissed as “just the seizure”.

Where next?

Seizure First Aid →
Postictal Recovery →
When to Call Emergency Services →
SUDEP — Straight Facts →
Back to Understanding Epilepsy →

Sources

Medical note: This page is educational. If a person is not breathing normally, has persistent cyanosis, prolonged apnoea, suspected aspiration or is not recovering as expected after a seizure, call emergency services.

Evidence checked: September 2026.