Numbness of inner thigh is related to peripheral neuropathy, hip joint lesion, vascular lesion and so on. 1. Peripheral neuropathy: the inner thigh is the part of the hidden nerve course, if the nerve occurs neurofibroma, nerve sheath tumor will cause nerve function abnormality, causing numbness of the thigh, and its numbness extends downward along the nerve course. If the tumor is small and the numbness is not serious, it can be observed dynamically and the ultrasound can be rechecked every half a year. If the tumor is large, it usually needs to be surgically removed to improve. 2. Hip joint lesions: such as hip synovitis, hip joint effusion, ischemic necrosis of the femoral head, which will cause pain and numbness around the hip joint, and also cause numbness in the inner thigh in serious cases. 3. Vascular lesions: plaque sclerosis of thigh arteries, phlebitis, etc. will cause nutritional disorders of the thigh, causing numbness of the inner thigh. There are many causes of numbness of the inner thighs, and it is recommended that patients go to the hospital for medical examination and treatment as prescribed by the doctor after clarifying the cause of the disease.