The numbness of the front of the thigh may be related to physiological factors, or it may be caused by lumbar intervertebral disc herniation, lateral femoral dermatitis and other reasons. 1. Physiological factors: such as maintaining a standing position for a long time, or the front of the thigh for a long time by the cold stimulation, etc., may lead to obstruction of venous return to the thigh, may cause the front of the thigh numbness. 2. Herniated lumbar intervertebral disc: the herniated intervertebral disc can easily lead to local nerve root compression, resulting in dysfunction of the part innervated by the compressed nerve, which may show numbness in the front of the thigh, and may be accompanied by radiating pain in the leg, restricted movement and other manifestations. 3. Lateral femoral cutaneous neuritis: this disease can lead to damage to the lateral thigh nerve, resulting in abnormal sensation of the skin on the front side of the thigh, which may cause numbness on the front side of the thigh, and may also be accompanied by leg pain, heaviness and other manifestations. Numbness of the front of the thigh may also be caused by other reasons, if the symptoms continue to be unrelieved, or there are other obvious discomfort, it is recommended to consult a doctor as soon as possible to clarify the cause of the disease, and then be guided by the doctor to treat and regulate.