Unilateral leg numbness and pain in the elderly may be caused by a herniated lumbar disc, which can be accompanied by lumbago and sciatic nerve radiating pain in the lower limbs. Symptoms are aggravated when abdominal pressure increases and need to be actively corrected by using dehydrating medication such as mannitol as prescribed by the doctor. Usually, attention is paid to strengthening nutrition, maintaining a good state of mind, active exercise and regular work and rest.