Epilepsy and Migraine/Headache – Epilepsy: The Untold Side

Overlapping neurological symptoms

Migraine and epilepsy are different neurological conditions, but they overlap in ways that can make diagnosis difficult. Visual symptoms, sensory changes, nausea, speech disturbance and altered awareness can occur in both, and headache can appear before, during or after seizures.

Key point: migraine aura usually develops gradually over at least 5 minutes and lasts 5–60 minutes, while focal seizure symptoms are often briefer, more abrupt and more stereotyped. These are useful patterns, not absolute rules.

Migraine and epilepsy can coexist

Migraine is more common in people with epilepsy than in the general population, and the two conditions share some biological mechanisms involving cortical excitability, ion channels, neurotransmitters and network instability.

Having one condition does not mean every new neurological symptom belongs to it.

Why they are confused

Both migraine aura and focal seizures can cause:

flashing lights or visual distortion
numbness or tingling
speech disturbance
nausea or abdominal symptoms
dizziness
altered perception
temporary neurological deficits

The most useful clues are often the speed of onset, duration, progression, repetition and what happens afterwards.

Migraine aura usually spreads gradually

NICE advises suspecting migraine aura when neurological symptoms are fully reversible, develop gradually over at least 5 minutes and last between 5 and 60 minutes.

Symptoms may occur in succession — for example visual disturbance followed by tingling and then speech difficulty.

Focal seizure symptoms are often shorter and more abrupt

Focal sensory, visual or language symptoms are often brief and stereotyped. NICE recommends urgent epilepsy assessment for recurrent brief fixed-pattern sensory disturbances lasting less than 2 minutes.

However, seizure duration varies, and some focal seizures last longer than 2 minutes. Duration alone cannot diagnose either condition.

Visual aura: migraine versus seizure

Migraine visual aura often produces gradually spreading zigzags, flickering lights, shimmering areas or patches of missing vision that evolve over minutes.

Occipital seizures more often produce sudden, brief and highly stereotyped visual phenomena, sometimes involving coloured circular shapes, flashing lights or rapid visual distortion.

The pattern is helpful, but visual symptoms can overlap enough that history and sometimes EEG or imaging are needed.

Sensory aura: migraine versus seizure

Migraine sensory aura often spreads slowly, for example tingling beginning in the hand and moving up the arm over several minutes.

Focal sensory seizures are more often sudden, brief and fixed in the same body region, although spread can occur.

Speech disturbance can occur in both

Migraine aura may cause temporary speech or language difficulty. Focal seizures can also produce speech arrest, aphasia or postictal language impairment.

A new speech deficit should never automatically be assumed to be migraine or postictal, because stroke can present in the same way.

Postictal headache is common

Headache after a seizure is a recognised postictal symptom. A systematic review and meta-analysis found postictal headache among the most frequently reported postictal manifestations.

The headache may resemble migraine, with throbbing pain, nausea, light sensitivity or sound sensitivity, or may be less specific.

Read more: Postictal Recovery →

Headache can sometimes occur during a seizure

Rarely, headache itself can be an ictal manifestation. The term ictal epileptic headache is used when headache occurs as part of ongoing epileptic activity and correlates with seizure-related EEG change.

This is uncommon and should not be assumed simply because someone with epilepsy develops headache.

Pre-ictal headache

Some people report headache before a seizure. This temporal association can occur, but a headache before a seizure does not prove that the headache triggered the seizure.

Interictal migraine

Many people with epilepsy also have ordinary migraine attacks between seizures. These should be assessed and treated as migraine rather than automatically linked to seizure timing.

What about “migralepsy”?

The term “migralepsy” has been used for a seizure occurring during or shortly after a migraine aura, but it is controversial and can be misleading.

The International Classification of Headache Disorders includes migraine aura-triggered seizure as a rare complication, while epilepsy literature has long questioned whether many reported cases were actually misclassified occipital seizures or other events.

For this reason, precise description of the sequence is more useful than using the informal term “migralepsy”.

Shared biology does not mean they are the same disorder

Migraine aura is linked to cortical spreading depression, while epileptic seizures involve abnormal synchronous neuronal firing. These are distinct processes, but both involve changes in cortical excitability and ionic balance.

Shared mechanisms may help explain why the conditions coexist more often than expected by chance.

Some medicines can treat both conditions

Several antiseizure medicines also have evidence for migraine prevention. Topiramate and sodium valproate are established examples, and other medicines may be chosen depending on the person’s epilepsy type and migraine pattern.

A medicine should not be chosen purely because it may help both conditions; seizure type, reproductive safety, interactions and side effects still matter.

Headache after a convulsive seizure

After a tonic-clonic seizure, headache may reflect the postictal state, muscle strain, dehydration, sleep disruption or injury.

If the person struck their head, has worsening pain, repeated vomiting, new weakness, unusual drowsiness or another concerning symptom, head injury must be considered rather than assuming the pain is postictal.

When headache is a red flag

NICE recommends further assessment when headache is associated with features such as:

sudden onset reaching maximum intensity within 5 minutes
worsening headache with fever
new neurological deficit
new cognitive dysfunction
change in personality
impaired consciousness
recent head trauma
headache triggered by cough, straining or exercise
headache that changes markedly with posture
a substantial change from the person’s usual headache pattern

Thunderclap headache is an emergency symptom

A sudden severe headache peaking within minutes can be a sign of subarachnoid haemorrhage and requires urgent assessment.

A seizure can occur with subarachnoid haemorrhage, so “they had a seizure” does not make a thunderclap headache less concerning.

New neurological symptoms with headache

New weakness, persistent aphasia, visual loss, severe imbalance or prolonged confusion need urgent assessment because stroke, bleeding and other acute neurological conditions may present with both headache and seizure.

Hemiplegic migraine and seizure

Hemiplegic migraine can cause temporary weakness as part of aura and may be mistaken for focal seizure or stroke.

Because sudden weakness can also be stroke, new motor aura should be assessed rather than self-diagnosed.

Migraine without headache

Migraine aura can occur without a subsequent headache. This can make the differential with focal seizures especially difficult.

Gradual progression over several minutes and a typical 5–60 minute duration favour migraine aura, while abrupt, very brief, repetitive fixed-pattern episodes favour focal seizures.

EEG is not a routine migraine test

EEG is not needed to diagnose typical migraine. It may be useful when the history raises genuine concern for epilepsy, especially with brief recurrent stereotyped visual, sensory or awareness changes.

A normal EEG does not rule out epilepsy.

Read more: Diagnosis and Tests →

Imaging is not automatically needed for typical migraine

NICE advises against routine brain imaging for people with migraine when there are no signs or symptoms suggesting another cause.

Imaging is considered when red flags, atypical neurological features or a substantial change in pattern raise concern for secondary headache.

Keep separate records for headaches and seizures

A combined diary can help show whether symptoms are migraine, seizure-related or independent.

Record:

what came first
how quickly symptoms developed
how long each symptom lasted
whether symptoms spread gradually
whether awareness changed
whether a headache followed
light/sound sensitivity, nausea or vomiting
medication taken
menstrual timing if relevant
sleep, stress and other possible triggers

The central point

Migraine aura and focal seizures can look alike, but the pattern over time often gives the strongest clue.

Migraine aura typically evolves gradually and lasts minutes; focal seizures are often more abrupt, briefer and stereotyped. Neither pattern is absolute, and new or unusual neurological symptoms deserve proper assessment.

Where next?

Auras and Focal Seizures →
Postictal Recovery →
Diagnosis and Tests →
Quality of Life and Comorbidities in Epilepsy →
Back to Understanding Epilepsy →

Sources

Medical note: New, severe or substantially changed headache — especially with thunderclap onset, fever, head injury, impaired consciousness or new focal neurological symptoms — needs urgent medical assessment and should not automatically be attributed to migraine or epilepsy.