In Pelvic Floor Muscle Disorder the muscles of the pelvic floor remain tightened. Normally these muscles are under voluntary control, but for some excessive tension can develop. Reasons for this are not well known but can be resultant from a natural disposition, learned reaction to stress or pain, trauma, or any combination of these. Excessive pelvic floor tension can result in various problems including frequent urination (due to the bladder's inability to expand) or pain. Treatments involve relaxing the muscles, using medication (such as Tamsulosin), Biofeedback, or physical therapy.
PT Hawaii Reference from Wikipedia (June 24, 2009)