Chocolate is often cited as a trigger for headaches and also Migraines. Research points to a combination of ingredients in Chocolate that may cause an attack. Cocoa and caffeine are key ingredients in chocolate and have potential to irritate or change the excitability of the central nervous system. Also Chocolate often contains high levels of sugars, which can interfere with normal #blood sugar level regulation, leading to secretion of the hormones that affect blood vessels in and around the head and face.