The reason why women are in a bad mood when they have their periods is mainly related to changes in hormone levels. The menstrual cycle is related to changes in the hormone levels of the ovaries. During menstruation, women’s hormone levels are in an unstable stage, plus there are many uncomfortable situations during menstruation, such as abdominal pain, back pain and other emotional changes, plus changes in hormone levels and discomfort can cause women to be in a bad mood during menstruation. Of course, it is still related to personality and individual differences, most women are able to control their emotions better during menstruation. It is recommended to take a good rest during menstruation, eat lightly, don’t overwork and don’t worry too much, and use a more stable mind to get through menstruation better.