Numb pain in the buttocks, clinically known as sciatica, sciatica may be caused by pyriformis syndrome, lumbar disc herniation and other diseases. 1. Pear-shaped muscle syndrome: pear-shaped muscle syndrome can lead to sciatica is determined by the anatomical location, the sciatic nerve is generally from the lower edge of the pear-shaped muscle through the sciatic nerve, when the sciatic nerve in the pear-shaped muscle travel area by the card pressure, it may be manifested as sciatica symptoms. Such as pear muscle trauma, as well as old pear muscle injury, anatomical variations. 2. Lumbar diseases: lumbar diseases cause buttock numbness and pain for similar reasons as pyriformis syndrome, which is also caused by nerve compression. For example, lumbar disc herniation, lumbar spondylolisthesis, spinal stenosis, etc. These lumbar diseases may lead to spinal nerve root or spinal cord nerve compression, neurosensory dysfunction, resulting in numbness, pain and other manifestations of the innervated area. If the pain is not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner to clarify the cause and then give targeted treatment.