Sore legs before and after menstruation may be related to premenstrual syndrome, pelvic congestion, iron deficiency anemia and other factors. 1. Premenstrual syndrome: some women may have premenstrual syndrome, mainly due to the hormone level changes before menstruation, resulting in metabolic disorders, which may cause severe leg pain before menstruation. 2. Pelvic congestion: the pelvis is congested before and after menstruation, which can easily lead to the lower limb blood flow is affected, resulting in poor blood circulation in the legs, which may cause severe leg pain. 3. Iron deficiency anemia: some women have iron deficiency anemia, which can lead to weakness of the lower limbs, leg pain and other symptoms. Especially before and after menstruation, the estrogen and progesterone in the body undergoes a big change, which is likely to aggravate the above mentioned discomfort symptoms, thus causing severe leg pain before and after menstruation. If you have sore legs before or after menstruation, you should pay attention to resting and keeping your legs warm, and if necessary, you should consult a doctor as soon as possible.