Though many people experience muscle twitching, it's often incorrectly identified as a muscle spasm. While both are involuntary contractions of a muscle, muscle spasms and muscle twitching aren't ...

Tweaked by a muscle twitch? From an uncontrollable fluttering eyelid to a pulsing calf muscle, these small, rapid involuntary muscle contractions may happen at any time — and can be annoying. A common ...

After a grueling CrossFit workout on a hot Summer morning that involved kettlebell swings, goblet squats, and about 100 walking lunges, my lower body was toast. But what was weird was that my left ...

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Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Involuntary muscle twitches are exceedingly common and yet not very ...

Dear Dr. Roach: I am a 68-year-old woman in good health. For the past several days, I have had muscle twitches all over my body — subtle ones, but nevertheless almost constant. This odd event has me ...

Q. What causes muscle twitches? They occur all over my body and drive me crazy. Can I take anything to alleviate them? A. Muscle twitching (the medical term is "fasciculation") is common and usually ...

Sometimes, I'll be concentrating super-hard when I'm on deadline--or, OK, fine, really not concentrating super-hard--when I realize something's off. A little muscle somewhere next to my nose will ...

DEAR DR. DONOHUE: I'm a high school senior, and I plan to major in some aspect of sports medicine in college. I've been reading about the different kinds of muscle fiber, and wonder if you'd discuss ...

Your body is made up of two kinds of muscle fibers: slow twitch (type 1) muscles, and "fast twitch" (type 2) muscles. "Slow-twitch muscles are the ones in charge of long endurance challenge—so they ...