Lumbar 4 herniation compression of the dural sac can be asymptomatic, or it can be manifested as lumbago, lower limb pain and motor sensory disorders, urinary and fecal dysfunction. 1. Asymptomatic: if the dural sac is simply compressed and the spinal nerve is not yet affected, the patient usually has no symptoms. 2. Lumbar pain: when the lumbar vertebrae or lumbar intervertebral disc herniation compresses the nerve roots, the patient may have the symptom of lumbar pain, and in addition, there will be radiating pain in the lower limbs. 3. Lower limb pain and dyskinesia: patients will feel not only radiating pain in the lower limbs, but also soreness in the soles of the feet and other parts of the body. In addition, the lower limbs will also feel numbness. In severe cases, the movement of the lower limbs is affected, with symptoms of claudication and limitation of lower limb activities. 4. Urinary and fecal dysfunction: when the cauda equina nerve is compressed, the patient not only has perineal sensory impairment, but also has urinary and fecal incontinence. Male patients may also have sexual dysfunction. For patients with dural sac compression, they should go to the relevant departments of regular hospitals as soon as possible, and be treated under the guidance of professional physicians, so as not to delay the condition and lead to the occurrence of adverse results.