A back spasm involves a sudden, involuntary muscle contraction that can be set off by something as routine as lifting a bag or sitting for too long. Muscle fatigue, dehydration, and nerve irritation ...

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 ...

You’re relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it’s a muscle in your arm, your leg, or your foot that begins to spasm – sometimes for a few seconds, sometimes for ...