店员：据我所知，可能的原因一般有气血循环差，经血运行不畅，经期剧烈运动、受风湿寒冷侵袭等。

• Shop assistant: As far as I know, the reasons might be a poor cycleof blood and loss of energy, an unsmooth flow of blood or exercisingvigorously during menstruation, or an attack of the cold.