Add Yahoo as a preferred source to see more of our stories on Google. Many of us have felt a muscle in some part of our body suddenly and involuntarily tighten, causing a twitch or even severe cramp.

A bladder spasm, also known as detrusor hyperreflexia, is when the bladder muscle squeezes involuntarily without warning. In addition to pain or discomfort, the spasms can lead to bladder leakage or ...