Spinal cord lesions and sciatica sometimes present with numbness in the limbs, a sign of damage to the spinal cord, peripheral nerves or peripheral nerves. There are many conditions that produce this symptom, including extremity disorders, medical conditions and spinal disorders. Extremity disorders such as frozen shoulder, shoulder-hand syndrome, elbow tenosynovitis, and lower extremity muscle pain. They are relatively easy to relieve, although they sometimes have a transient numbness sensation. Diabetes, certain vitamin deficiencies, hereditary sensory deficiencies, and occlusive arteriosclerosis (numbness and pain in the lower extremities when walking) are all medical conditions that require examination and treatment in internal medicine. Cervical spondylosis, ossification of the posterior longitudinal ligament (OPLL), spinal cord tumors, lumbar disc herniation, and lumbar spinal stenosis require diagnosis and treatment at a spine specialist. Of course, nerve pain and numbness (peripheral nerve compression) in the elbow and wrist/hand joints should also be treated at an orthopedic clinic. It is important to emphasize that when the degree and extent of numbness expand, it is necessary to go to the appropriate specialist for examination and treatment.