If the waist to thigh soreness, the following reasons are common: first, lumbar disc herniation: high lumbar disc herniation will cause lumbar soreness, but also thigh root, thigh anterior soreness, and low lumbar disc herniation will cause lumbar and thigh posterior soreness symptoms, through the MRI examination, CT examination, to be able to confirm the specific stage of the lumbar disc herniation and the severity of the degree. Secondly, lumbar back fibrositis: it will also cause the clinical symptoms of lumbar to thigh soreness, and in severe cases, it can involve the calf and foot, and most of the patients are sore on one side of the lumbar area, and pressing the area of lumbar back fascia and inflammation will bring some degree of relief to the clinical symptoms. If the waist to thigh soreness, through early diagnosis, early treatment, can make the clinical symptoms quickly reduce, to avoid aggravation of the condition, and affect the normal life.