Mannitol itself cannot be used directly to treat a herniated lumbar disc, but it can be used to relieve neuroedema caused when a herniated lumbar disc presses on a nerve. Mannitol is a dehydrating drug that is mainly used in cerebral edema, Meniere’s disease, hyponatremia and other diseases that can cause edema. On the other hand, lumbar disc herniation is mainly caused by degenerative lesions of the lumbar disc, which does not directly cause edema. Therefore, mannitol itself cannot be directly used to treat lumbar disc herniation. However, when the lumbar disc herniation can cause edema after compression of the nerve, then you can use mannitol for treatment, to play the role of dehydration, which can play a certain role in relieving the nerve symptoms. The use of mannitol must follow the doctor’s instructions, to avoid improper use of water and electrolyte disorders, dizziness, nausea and other adverse reactions, causing harm to the body.