In fact, I have learned from my clinical practice as a doctor that calcium deficiency does not cause lower limb cramps at night. The reason is the poor blood return to the lower limbs! After we treated the inguinal ligament at the beginning of the inguinal ligament by releasing the internal femoral recess muscle group through manipulation, the patient’s lower limb cramps at night were gone. The reason for this is that the lower extremities are also cramped at night after you have not taken calcium supplements yourself! If a long time calcium supplementation is prone to stone disease. It is recommended that you pay attention not to sit for a long time, not to stand for a long time, to do reverse movements, to make the extensor muscles of the lower limbs get traction, to promote blood return to the lower limbs, or to press the inguinal ligament with your fingers.