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LOGY AND MECHANISMS ? The specific cause is unknown. ? Key factors include: (1)Hereditary factorsfamilial history 60% (2)EEG depression (3)Decrease of CBF(5HT1b receptor) (4)Increase of platelet aggregation KEY FACTORS (5)Dietetic factors: chocolate, fatty foods, oranges, tomatoes, onions and alcohol, etc. (6)Endocritic factors: The incidence of migraine in females is about twice than that in males, and the headaches tend to occur during period of premenstrual tension. (7)Inducement: overwork, hunger, climate, sleeplessness CLINICAL PICTURE 1. Migraine with a