There are multiple factors that interact with headaches and nausea when you have your period. Consider the following factors that may have a lot to do with it. : I. Changes in the activity of brain neurotransmitters can appear as headaches, for example, some women who are neurosensitive themselves can have more pronounced headaches during menstruation. Second, vitamin B6 deficiency, may appear nausea, vomiting symptoms. Third, changes in ovarian hormones, during menstruation due to the level of sex hormones in the body, can change and lead to headaches. Fourth, psychosocial factors, some women may be more nervous, too much stress may occur headaches. Five, the role of prostaglandins, prostaglandins can enter the blood circulation, can cause smooth muscle contraction in the gastrointestinal tract, urinary tract and blood vessels and so on and nausea, vomiting, and flushing, fainting and other symptoms.