When menstruation two legs especially tired may be related to overwork, hormone level changes, lumbar spine is not good and so on. 1. Overwork: women’s resistance during menstruation tends to decline, if overworked or after strenuous exercise, you may feel lower limb pain and fatigue, can be relieved after sufficient rest. 2. Hormone level changes: women have hormone level changes during menstruation, pelvic congestion, easy to appear waist and abdominal swelling, abdominal discomfort. Abdominal and pelvic discomfort may cause women to mistake discomfort in the lower limbs. 3. Bad lumbar spine: If the patient himself has lumbar spine disease, it is easy to compress the spinal cord and nerves, then there will also be the phenomenon of tired legs. Therefore, when both legs feel tired and there is no relief through rest or the symptoms gradually worsen, you need to go to the hospital to clarify the cause of the disease.