difficult menstruation

例句：

1. 1. She has been experiencing difficult menstruation for the past few months.
   她过去几个月一直经历着月经困难。
2. 2.The doctor advised her to take a rest and avoid strenuous activities during her difficult menstruation period.
   医生建议她在月经困难期间休息并避免剧烈运动。
3. 3.Difficult menstruation can be caused by various factors, including stress and hormonal imbalances.
   月经困难可以由多种因素引起，包括压力和激素失衡。