The symptoms of L4-5 disc herniation are mainly lumbar pain accompanied by radiating pain and numbness in the lower limbs. 1. Lumbar pain: it is the first symptom that appears in most patients. Lower back pain is caused by the protruding nucleus pulposus irritating the surrounding lumbar nerves, and sometimes the pain radiates to the buttocks. 2. Unilateral or bilateral radiating pain in the limbs: mainly because the nucleus pulposus of lumbar 4 and 5 intervertebral disc herniation oppresses the nerve root of the corresponding segment, resulting in the sciatic nerve being compressed, and obvious radiating pain and numbness can be seen from the buttocks all the way to the lateral side of the calf and the lateral side of the foot, and the radiating pain of the lower limbs will be more obvious when the abdominal pressure is increased during sneezing or coughing. 3. Cauda equina compression symptoms: due to the prolapse of the protruding nucleus pulposus and compression of the cauda equina nerve, it can manifest as mild dysfunction of urination and defecation, as well as perineum and perianal sensory abnormalities. In severe cases, there may even be incontinence or incomplete paralysis of both lower limbs. When a lumbar 4-5 disc herniation occurs, it is important to consult a doctor in a timely manner, and under the guidance of a specialist, actively carry out targeted treatment, which will help to alleviate the symptoms as soon as possible.