What Triggers Ophthalmic Migraines with Aura?
Migraine with aura is triggered by a variety of factors, with menstruation being the most prominent trigger, followed by stress (particularly work-related), bright or reflected light, sleep deprivation, hunger, and certain environmental exposures like perfume and passive smoke. 1, 2
Primary Triggers Based on Evidence
The most well-characterized triggers for migraine with aura include:
Hormonal Factors
- Menstruation is the single most prominent trigger for both aura and headache phases 2
- Hormones cause at least 50% of attacks in 62% of patients with migraine aura 3
- Combined hormonal contraceptives are contraindicated in women with migraine with aura due to increased stroke risk 1
Visual and Light Stimuli
- Reflected sunlight triggers attacks in 79% of patients who identify light as a trigger 3
- Bright or flickering light causes at least 50% of attacks in 47% of patients 3
- Photophobia is present in 76% of patients and is significantly associated with visual triggers like flicker and glare 4, 5
- Exposure time of less than 3 hours to light triggers is sufficient, with attack onset typically within 3 hours 3
Stress and Work-Related Factors
- Excessive work is reported by 84% of patients who identify stress as a trigger 3
- Psychic tension increases risk of attacks 2
- Stress causes at least 50% of attacks in 42% of patients 3
Sleep and Fatigue
- Sleep deprivation (too little sleep) is a consistent trigger 3
- Tiredness increases attack risk 2
- Conversely, holidays and days off decrease aura risk 2
Dietary and Metabolic Factors
- Hunger significantly increases aura risk 2
- Red wine triggers attacks in 91% of patients who identify alcohol as a trigger 3
- Chocolate has been reported as a trigger in experimental studies 6
Environmental Exposures
- Perfume and heavy scents trigger attacks in 80% of patients who identify fumes as triggers 3
- Passive smoking is reported by all patients who identify smoke as a trigger 3
- Interestingly, active smoking increases aura risk but decreases risk of migraine without aura 2
Physical Activity
- Strenuous exercise can trigger attacks, with 33% of provoked patients developing migraine following exercise in experimental settings 7
- Physical effort requires less than 3 hours exposure with onset within 3 hours in 90-100% of susceptible patients 3
Important Clinical Considerations
The relationship between triggers and attacks is not absolute. When patients with self-reported consistent triggers were experimentally exposed to these factors, only 11% developed aura attacks, with an additional 11% developing migraine without aura 7. This suggests that triggers likely require a combination of factors or a specific physiological state to precipitate attacks.
Trigger latency is typically short. For most environmental triggers (light, fumes, smoke, physical effort), exposure time of less than 3 hours is necessary, with attack onset occurring within 3 hours in 90-100% of cases 3.
Pathophysiological Context
The underlying mechanism involves cortical spreading depression (CSD) in the occipital cortex, which manifests as the characteristic visual symptoms (scintillating scotomas, fortification spectra) 8, 9. Triggers likely precipitate attacks in susceptible individuals through increased cortical excitability, increased neural noise, and fluctuations in oscillatory activity 9.
Clinical Pitfalls to Avoid
- Do not assume all self-reported triggers are causative—prospective confirmation through diary studies is important 7, 2
- Recognize that trigger avoidance alone is insufficient for management; identifying triggers should be part of a broader treatment strategy 1
- Be aware that isolated aura without subsequent headache can occur and should still be recognized as migraine 10
- Remember that aura symptoms develop gradually over ≥5 minutes and spread progressively, distinguishing them from sudden-onset TIA symptoms 1