The first is that the prostaglandins in the bloodstream can cause the smooth muscle of the gastrointestinal tract, urinary tract and blood vessels to contract and cause nausea and vomiting. Some women can also experience flushing and fainting, which is related to the different levels of prostaglandins in the bloodstream and the severity of the symptoms. Secondly, when menstruation occurs due to changes in the body’s hormone levels, progesterone levels are relatively high, there may also be symptoms of nausea and vomiting. Third, if the body lacks vitamin B6, vomiting may also occur during menstruation. During menstruation, a light diet, small and frequent meals, and avoiding the intake of cold and spicy stimulating foods can improve the situation of wanting to vomit during menstruation, and if necessary, you can also consider taking vitamin B6.