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Reference.org
Irregular menstruation
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<p>Irregular menstruation is a <a href="/facts/Menstrual_disorder/zfytcBDT">menstrual disorder</a> whose manifestations include irregular cycle lengths as well as <a href="/facts/Metrorrhagia/pgysn5pd">metrorrhagia</a> (<a href="/facts/Vaginal_bleeding/wLT7D34y">vaginal bleeding</a> between expected periods). The possible causes of irregular menstruation may vary. The common factors of it are related to lifestyle, such as stress, body weight, and smoking status. Several studies indicate that <a href="/facts/COVID-19_vaccine/obToxWTT">COVID-19 vaccine</a> of any type may disrupt the menstrual cycle, although only momentarily. This side effect should resolve on its own in the following month. </p>