Normal blood sugar but numbness of the feet may be related to improper posture, vascular disease, lumbar spine disease, nerve disease and other reasons. 1. Improper posture: If you keep squatting and other improper postures for a long time, it can cause poor blood circulation in the feet and numbness. 2. Vascular diseases: such as varicose veins of the lower limbs, due to the dysfunction of the venous valves, can cause insufficient blood supply to the feet, the symptoms of tingling. 3. Lumbar spine diseases: such as lumbar disc herniation and other diseases compressing the nerve root, can cause numbness in the innervated area. 4. Nerve diseases: such as peripheral neuritis and other diseases, can cause numbness of the feet. It is recommended that people with normal blood sugar but numb feet go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.