What is functional rectal pain syndrome?

Levator syndrome. Functional rectal pain syndrome is pain in the pelvic floor without any obvious abnormality. There are a couple of different types, but levator syndrome is the most common. Patients complain of severe pain, often on one side. It usually comes and goes, rather than being there all the time. Workup usually doesn't show anything obviously wrong. Some patients have tenderness or muscle spasm.
See below. Functional rectal pain syndrome is a rectal pain which cannot be explained and is accompanied by negative tests (manometry, colonoscopy) . It can be a variant of irritable bowel syndrome.