Although the pain of IC/PBS is poorly understood, almost all clinicians agree that there is almost always some chronic tension and tenderness of the pelvic floor musculature present in UPPS patients,8-10 and it is possible that these myofascial abnormalities contribute significantly to the pain of IC/PBS. For example, Hetrick et al11 compared the surface EMG signals from men with CPPS to those from men without chronic pain, and found that there was greater EMG instability in men with CPPS, along with increased baseline tonicity, and instability with lowered voluntary endurance contraction amplitude.