Numbness in the lateral thigh without sensation is usually considered lateral femoral dermatomal neuritis, also known as lateral femoral dermatomal neuropathy, abnormal sensory femoral pain, which refers to a series of symptoms caused by the influence of some mechanical compression or chemical factors on the femoral nerve during its travel. The main symptoms are pain and numbness in the skin of the front or outside of the thigh in the area where the lateral femoral cutaneous nerve is located, sometimes with symptoms similar to sciatica. In mild cases, the pain is only mild when moving around, but in severe cases, the pain can affect activities such as bending and walking. The pain often worsens after activity and decreases after rest or when the hip is flexed. The course of the disease is often unconsciously progressive, and there are usually no obvious symptoms of the whole body. For the treatment of this disease, it is necessary to clarify the cause and location of the disease and base on the treatment for the cause. If it is clear that the pain is caused by mechanical compression, the symptoms are generally more severe, the course of the disease is longer, the disease is more stubborn, and the treatment effect is poorer. If the pain is caused by inflammation or fibrous tissue adhesions, local injections, such as those in the psoas major muscle or in the groin, can be performed after the location is determined. The drugs used generally include steroid hormones, local anesthetics, B vitamins, etc., and antibiotics can be used. Generally, those with relatively mild disease can obtain relief of symptoms after such treatment, and consolidation of treatment once a week is generally more effective.