Spondyloarthropathies and Fibromyalgia

A 27-year-old man presents to the outpatient clinic with two years of insidious low back pain that wakes him at 3 AM and forces him to pace before he can return to sleep. The pain improves with walking and worsens with sitting. He also reports alternating right and left buttock pain, occasional posterior heel pain, and one episode of unilateral painful red eye six months ago.