Thigh root numbness refers to thigh root numbness, common causes are: pyriformis syndrome, lumbar disc herniation, diabetes complications. 1. Piriformis syndrome: due to trauma, sedentary, cold and other reasons, causing inflammatory reaction and adhesion of the piriformis muscle, thus compressing and stimulating the sciatic nerve, causing pain and numbness in the buttocks can be radiated to the thigh. 2. Lumbar intervertebral disc herniation: due to the herniation of intervertebral disc, the nucleus pulposus protrudes and compresses the dural sac and the nerve root, and the pressure on the nerve root can cause pain in the direction of the sciatic nerve, which is clinically manifested as pain and numbness in the lower limbs. 3. Diabetic complications: due to long-term blood sugar control is not good, causing peripheral neuropathy, nerve damage can be pain, numbness, sensory abnormalities and other symptoms. Causes of numbness at the root of the thigh are more reasons, may also be related to trauma-induced nerve injury and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, and to carry out targeted treatment.