The causes of leg numbness are very many, such as lumbar disc herniation, pear-shaped muscle syndrome, peripheral nerve entrapment, as follows: 1, lumbar disc herniation: leg numbness is most common in lumbar disc herniation, lumbar disc herniation, the disc tissue will compress the spinal nerve, thus causing radioactive pain in the lower limbs, accompanied by numbness in the foot. If the lumbar 5 nerve root is compressed, mainly the dorsum of the foot is numb, and the sacral 1 nerve root is compressed, mainly the heel and sole of the foot is numb. 2. pear-shaped muscle syndrome: pear-shaped muscle syndrome is a syndrome in which the sciatic nerve is compressed at the level of the pear-shaped muscle, which also causes radiating pain in the lower limbs, accompanied by numbness in the foot. 3. peripheral nerve entrapment: it may be a peripheral nerve entrapment, such as the anterior lateral femoral cutaneous nerve passing through the iliac crest to reach the anterior femoral If this nerve is compressed in the iliac crest, it will cause numbness and abnormal sensation in the skin of the anterolateral thigh.