Adrenaline increases the "alertness" of the nervous system, meaning it's ready to trigger muscle contraction. It also increases the amount of blood flow and changes the tension of the muscles, which, ...

Infectious agents can cause muscle twitching and spasms, too. The most commonly known is probably tetanus, which causes a phenomenon called lockjaw, where the neck and jaw muscles contract to the ...

Twitching leg muscles aren't uncommon after a long walk or exercise session. Although muscle twitches may cause you to worry about the health of your leg muscles, in most cases, twitching doesn't ...

It only takes one ill-timed leg twitch to jerk you right from the precipice of a deep slumber. Sometimes it's only a little ...