There are several possible causes for the left buttock and thigh pain: first, pear-shaped muscle syndrome, pear-shaped muscle syndrome can appear in the hip pear-shaped muscle pain, at the same time can appear the symptoms of sciatic nerve compression, resulting in the buttock and thigh pain symptoms, to carry out the relevant physical examination, as well as electromyography examination, to carry out early diagnosis and treatment. Second, lumbar disc herniation, lumbar disc herniation compression nerve root, can also appear sciatica symptoms, can appear from the buttocks has been connected to the thigh pain symptoms, to carry out related CT, nuclear magnetic examination, to carry out early diagnosis and treatment. Third, lumbar spinal stenosis, lumbar spinal stenosis, can also appear nerve compression, and lead to buttock and thigh pain, to carry out relevant lumbar spine examination, to carry out early diagnosis and treatment.