What is piriformis syndrome?
Your piriformis (say: “peer-ee-form-us”) muscle runs from your lower spine to the top of your thigh bone. Piriformis syndrome occurs when this muscle presses on your sciatic nerve (the nerve that goes from your spinal cord to your buttocks and down the back of each leg). This can cause pain and numbness in your lower body.
Written by familydoctor.org editorial staff