Piriformis syndrome is a condition in which the piriformis muscle, located in the buttocks, becomes tight or inflamed and compresses the sciatic nerve. This can cause pain, numbness, and tingling in the buttocks, hip, and leg. Some synonyms for piriformis syndrome include pyriformis syndrome, piriformis muscle syndrome, and sciatica caused by piriformis syndrome. Other terms that can be used to describe this condition include buttock pain syndrome, hip pain syndrome, and gluteal muscle pain syndrome. These terms all refer to similar symptoms and causes of discomfort and can be used interchangeably with piriformis syndrome.