What is a headache before menstruation?

Headache and stomachache before menstruation is the manifestation of premenstrual syndrome, which is due to the decrease of estrogen in women about to menstruate, the increase of prostaglandin secretion, endocrine disorder, headache and stomachache caused by hormone changes, it is recommended that women relax their mood, rest more during menstruation, and pay attention to keeping warm.