Knee pain during menstruation is caused by several different reasons: first, consider the normal physiological pain, during menstruation there will be a lot of physical and mental discomfort, there will be abdominal pain, waist and knee pain, knee pain, you can not worry too much, usually pay more attention to rest. Second, consider the pain caused by cold stimulation or calcium deficiency, the body resistance is poor during menstruation, cold stimulation will appear after the knee pain, you can take hot compresses to relieve pain. Third, the knee pain is considered to be caused by reactive arthritis or trauma to the knee joint. If the pain is serious, it is recommended that you go to the hospital in time to avoid serious problems, pay more attention to rest during menstruation, and it is best not to engage in strenuous exercise.