You could be fast asleep when suddenly, a sharp, paralyzing stiffness jolts you awake—usually in your calf or foot. These episodes, commonly known as foot or leg cramps, occur when a muscle tightens ...

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.

Just when I thought I had a real handle on panic attacks (after all, I wrote a book on the topic), something new came to my attention. A number of people have recently mentioned that, during a panic ...