This can cause painful periods and irregular periods.
这可能会导致痛经和不规则时期。
Buzzfeed 女性时尚杂谈
Should I go to the doctor for irregular periods?
我应该去看医生吗？
挪威的森林 Norwegian Wood
Like family, like boyfriends, like irregular periods.
就像家人，就像男朋友，就像月经不调。
绝望的主妇视频版 第4季
But you say you've been having irregular periods.
但是你说你的例假一直不正常。
TED演讲（音频版） 2022年11月合集
After the COVID-19 vaccine was rolled out, there were reports online of people experiencing irregular periods or changes in their menstrual cycle.
COVID-19 疫苗推出后，网上有报道称人们月经不调或月经周期发生变化。
英语百科
Irregular menstruation
Irregular menstruation is a menstrual disorder whose manifestations include irregular cycle lengths as well as metrorrhagia (vaginal bleeding between expected periods).