Thigh pain during menstruation is caused by dysmenorrhea. During menstruation, the hormone level in the body will change and the body will be weaker, so there will be thigh pain and even generalized soreness. If there is venous stasis in the pelvis during menstruation, the veins of the lower limbs will be compressed, and after the normal return of blood is impeded, the menstrual blood does not flow smoothly during menstruation, and the symptoms of leg pain will appear, and then the patient’s lower back will also suffer from pain. If leg pain occurs once in a while, it may not be related to menstruation. During menstruation, if one is overworked, such as running for a long time, thigh pain will occur. If thigh pain occurs every time during menstruation, it means that the patient suffers from deficiency of qi and blood during menstruation, and the leg pain is caused by the poor functioning of qi and blood, so more qi should be replenished and blood should be nourished. As the patient’s body resistance decreases during menstruation, examination should be carried out when the leg pain is severe.