Women drink coffee during menstruation, if only occasionally and in moderation, there are generally no obvious adverse effects, if often or in large quantities, it will cause some adverse consequences, common hazards include: 1, because of the excitatory effect of caffeine on the smooth muscle of the uterus, will lead to contraction of the smooth muscle of the uterus, which is not conducive to the discharge of menstrual blood, seriously causing dysmenorrhea symptoms. 2, because caffeine will excite the female The main risks include: 1. because caffeine excites the cardiovascular system and the central nervous system, it may cause panic, palpitations, insomnia, dreaminess and other symptoms. 3. drinking coffee during menstruation may also lead to endocrine dysfunction and accelerate the aging process of the ovaries. 4. the excitatory effect of caffeine on the central nervous system may also cause irritability and anxiety in women during menstruation.