Fasciculations are a notable, visible part of most ALS symptoms. I’ve had fasciculations for about 35 years, dating back to a bout with shingles when our kids were young.
An involuntary muscle twitch, usually localised and temporary, but that may be intensified and prolonged fatally by particular poisons and venoms such as acetylcholinesterase inhibitors.
Another bout of shingles a few years ago set off even more fasciculations. Cramp fasciculations are worse.
Cramp-fasciculation syndrome (CFS) is primarily associated with spontaneous, painful muscle cramps and muscle twitches (fasciculations), in the absence of an associated underlying diagnosis.
Mine are in the abdominal region and occur with movement, coughing, and sneezes. They are painful but don’t last too long. They were also a precursor to something gone wrong.