Precipitating Factors
• "Anything under the sun including sun" can precipitate an attack, but each person has his own triggering factors. • Commonly, these are stress, exposure to bright light, loud noises, smoke or strong scents, menstruation, lack or excess of sleep, cheese, caffeine, alcohol, chocolate, citrus fruit and food additives such as monosodium glutamate, vasodilators, exercise and contraceptive pills. • Familial tendency is usual.
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