Piriformis syndrome is usually caused by the piriformis muscle irritating or compressing the sciatic nerve, often because the muscle is inflamed, tight, or spasming. Common triggers include overuse, prolonged sitting, poor body mechanics, injury to the buttock or hip, and less commonly, anatomical differences in the muscle or nerve path.

Main causes

  • Muscle inflammation or swelling.
  • Muscle spasm or tightness.
  • Scar tissue in or around the muscle.
  • Overuse from running, cycling, repetitive motion, or vigorous exercise.
  • Long periods of sitting, especially in awkward positions.
  • Direct injury or trauma to the buttock, hip, or leg.
  • Structural differences, such as an unusual piriformis muscle or sciatic nerve course.

Quick note

It can feel similar to sciatica, but piriformis syndrome specifically involves the piriformis muscle pressing on the sciatic nerve rather than a problem in the spine. If you want, I can also give you the most common symptoms or a simple at-home management guide.