Calcium deficiency can lead to numbness of legs and feet, but it may also be caused by lumbar disc herniation, cerebrovascular disease and so on, as follows. 1. Calcium deficiency: If there is a serious calcium deficiency, it will lead to the confusion of nerve function, and at the same time cause vascular spasm, resulting in peripheral blood circulation disorders, numbness of legs and feet, arrhythmia and other symptoms. 2. Herniated lumbar intervertebral disc: the nucleus pulposus protrudes backward, compressing the nerve root or spinal cord, leading to impaired local blood circulation and affecting the lower limbs, resulting in numbness of legs and feet. 3. Cerebrovascular disease: mainly associated with atherosclerosis, thrombosis and other factors leading to arterial lumen narrowing or occlusion, poor blood circulation, resulting in neurological deficits, numbness and other symptoms of the legs and feet, mostly unilateral numbness. Numbness of the legs and feet may also be caused by other reasons, it is recommended to consult a doctor in time to identify the cause of the disease, and follow the doctor’s instructions for treatment.