Numbness and pain in the thighs may be caused by the following reasons: 1, dermatoneuritis of the peripheral nerves. Dermal nerves throughout the body, when the nerves innervating the skin sensation inflammation, there will be localized numbness and pain in the thighs, often palm-sized area of discomfort. 2, lumbar disc herniation. When it is high lumbar disc herniation, such as lumbar 2, 3, lumbar 3, 4 intervertebral disc herniation, it can compress the nerve root and lead to numbness and pain on the front side of the thigh. At this time, the lumbar spine CT, nuclear magnetic and X-ray examination for diagnosis and treatment. 3, nerve compression. When the skin nerve muscle surface of the fascia out of the cardiac compression, the thigh will be localized regional numbness, pain symptoms, this time to carry out the relevant physical examination for diagnosis.