During menstruation, except for the abdomen and waist can not be massaged, other positions can be massaged. Because during menstruation, if you massage the abdomen and waist, it may lead to the uterine cavity of the menstrual blood reflux situation, mainly in the massage stimulation caused by uterine contraction, will make the menstrual blood along the fallopian tube into the pelvic cavity. There is a small amount of endometrium in the menstrual blood, and the endometrium will be planted in the pelvic tissue, causing the possibility of endometriosis. This can lead to dysmenorrhea in the future, which is progressively worse, infertility or irregular vaginal bleeding. Therefore, it is important not to massage the abdomen as well as the lower back during menstruation.