ALS, or amyotrophic lateral sclerosis, is a progressive neurodegenerative disorder affecting the motor neurons in the central nervous system. The early symptoms of ALS include muscle twitching or ...

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 ...