Knee pain in women during menstruation is related to the change of hormone level in the body during menstruation, or nutritional deficiency, etc. 1. It may be due to the decrease of hormone level secreted by ovaries, women’s body will appear to have muscle pain, fatigue and weakness, which may be more obvious in women’s performance in knee pain. 2. It may also be related to women’s own calcium deficiency and other conditions, or knee joint pathology. When women exist with knee pain, during the period due to poor resistance, immunity, can also lead to knee pain. Therefore, women should pay attention to proper rest during menstruation and the knee can be relieved by proper massage. If you are not able to relieve the necessary time, you can also go to the hospital after the menstrual period to do a fluoroscopy, film examination, in order to clarify the lesion to give early treatment. 3, women in the menstrual period walking too long, strain, can also lead to knee pain.