FND Symptoms Triggered by Migraine
Migraine attacks can trigger functional seizures (FND-seizures), which are the most well-documented FND symptom precipitated by migraine, occurring in approximately 65% of patients with both conditions. 1
Primary FND Symptoms Triggered by Migraine
Functional Seizures (Most Common)
- Epilepsy-like events that occur during or following migraine attacks are the predominant FND manifestation triggered by migraine 1
- These functional seizures show a stronger association with migraine than epileptic seizures do with migraine in comparative studies 1
- The temporal relationship is clear: migraine attacks may predate FND symptoms by up to 10 years, establishing migraine as a predisposing factor 2
Other Potential FND Symptoms
While the evidence is strongest for functional seizures, migraine may trigger the broader spectrum of FND symptoms including:
- Motor symptoms (weakness, tremor, jerks, dystonia) 3
- Sensory symptoms 3
- Cognitive deficits 3
- Persistent postural perceptual dizziness (PPPD) - which has a particularly well-characterized relationship with migraine 4
Clinical Context and Mechanisms
The relationship between migraine and FND appears bidirectional and mechanistically linked:
- Shared pathophysiology: Both conditions involve dysregulated allostatic/stress responses within predictive processing models of brain function 4
- Common comorbidities: Female gender, adverse childhood experiences, psychiatric disorders, irritable bowel syndrome, and fibromyalgia are more prevalent in both conditions 4
- Migraine as a neurological trigger: Similar to how other neurological disorders can precipitate FND, migraine attacks serve as established triggers 4
Important Clinical Pitfalls
Avoid underdiagnosis: Headache is likely the most common neurologic comorbidity in FND but is frequently underrecognized in clinical practice 2, 5. Always obtain a detailed headache history in FND patients.
Avoid overdiagnosis: While the association is strong, not all symptoms during migraine attacks are functional - careful clinical assessment is needed to distinguish migraine aura (visual fortification spectra, unilateral paresthesia spreading gradually) 6 from functional neurological symptoms.
Treatment Implications
Treating migraine may reduce FND symptoms: In patients where migraine triggers FND-seizures, migraine prophylactic medications alone (without behavioral interventions) reduced both FND-seizure and headache frequency by >50% in 73% of patients 1. This suggests that addressing the migraine trigger can directly improve functional symptoms, supporting an integrated therapeutic approach 5.