If the decrease in menstrual flow is caused by taking a bath during your period, it is likely that the bath water is cold, so it causes vasoconstriction, resulting in a decrease in menstrual flow. You can drink hot brown sugar and ginger water, which has the effect of expelling cold and warming the uterus and improving the reduced menstrual flow. If it happens to be a coincidence that the decrease in menstrual flow is due to endocrine disorder, it is also recommended to have an endocrine test, such as a blood test for sex hormone six, to find out if the decrease in menstrual flow is due to endocrine disorder, and then give the appropriate treatment according to the results. It is recommended that women should keep warm during their menstrual period and not get cold. It is also recommended to soak the feet with hot water every day when menstruation comes to accelerate the local blood circulation, which can make the menstruation discharge more smoothly and reduce the uncomfortable symptoms during menstruation.