I've never had a sugar headache, but it is probably caused by a sudden change in your blood sugar level. One of the symptoms of a low blood sugar is a headache. Others can include blurred vision, "fuzzy thinking", weakness, shakiness, drowsiness, up to and including coma if it drops too low. If you consume large amounts of sugar at one time, your body makes a large amount of insulin to cover it, and then you "crash" when its gone.
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