The most common cause of sudden throbbing pain in the thigh is pain caused by a herniated lumbar disc pressing on a nerve, which is mainly characterized by radiating pain and sometimes numbness. Depending on the location of the pain, the segment of the lumbar disc herniation is also different. In the case of a herniated disc in the third or fourth lumbar vertebra, the nerve that is compressed is mostly the fourth lumbar nerve root, and the area innervated by the fourth lumbar nerve root is mainly characterized by radiating pain in the anterior medial aspect of the thigh. If it is a herniated disc of lumbar four or five, the nerve root compressing the lumbar five nerve root, then the posterior and lateral radiating pain of the thigh will appear. If it is a herniated disc of lumbar five sacral one, then the corresponding pain area should be the posterior, buttock area of the thigh. Regardless of the pain caused by the nerve compression caused by a herniated disc, a CT or MRI examination of the lumbar spine should be completed at this time to clarify the cause and the extent of the herniated disc, and then a suitable treatment plan should be taken according to the condition.