Dysmenorrhea refers to pain, distending and bearing-down sensation in lower abdomen, limp loin and some other discomfort which disturbs work and daily life before, after or during menstruation. It can be divided into primary and secondary dysmenorrhea.

• 痛经是指月经前后或行经期出现的下腹疼痛、腰酸、下腹堕胀或其它不适,且影响工作和生活的症状称为痛经,痛经又可分为原发性和继发性两种。