megalgia

Dysmenorrhea is a kind of periodic gynecopathy, which happens on lower abdominal pain,or lumbosacral dragging pain, even syncope due to megalgia during menstruation and before or after of it.
痛经是指妇女在经期或经行前后，出现周期性小腹疼痛，或痛引腰骶，甚至剧痛晕厥，故亦称“经行腹痛”。