The left leg and foot have no hot and cold sensation also burning sensation consider lumbar disc herniation, pear-shaped muscle syndrome, radiculitis, diabetic neuropathy, cerebrovascular disease. 1. Lumbar disc herniation: Nucleus pulposus dehydration and degeneration protrusion compression of nerves can cause sensory disorders in the left leg and foot without hot or cold sensation, there will be a burning sensation, and unfavorable activity of the lower limbs. 2. Piriformis syndrome: the swelling of the piriformis muscle compresses the sciatic nerve, causing sensory disturbances in the buttocks, the back of the thighs and the calves, and localized burning sensation. 3. Radiculitis: sensory impairment of the limbs, weakness of the lower limbs, lack of balance, sensory ataxia can occur. 4. Diabetic neuropathy: due to the long duration of diabetes mellitus caused by nerve damage, the lower limbs burning sensation, ant walking sensation, sensory loss. 5. Cerebrovascular disease: hemiplegia causes unfavorable movement and sensory loss in one side of the limb. Therefore, the left leg and foot have no hot and cold sensation and burning sensation, you need to go to the hospital to check the cause of the disease for treatment.