Quoted:
Quoted: No. If you're worried about motor neuron disease, don't be. The more focal the fasciculations/muscle spasm the less likely it is related to ALS.
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I get them in other muscles sometimes as well. My left bicep will have twitching fits as well. Sometimes for a day or two. This has been a week though.
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If it were due to ALS then you should also experience weakness. It is rare to see the twitches without the weakness, although as the disease progresses the twitches go away. From what you posted it sounds like you are under some stress, even if only 'subconscious' stress. This will make the nerves more likely to fire on their own which causes the muscles to twitch. A week is nothing for this. They can go on for months and I've seen one guy, a vet, with a condition called Benign Fasciculation Syndrome who's calves looked like a bag of worms and they'd done that for 20+ years.
While nothing can replace a thorough history and physical, unless you have other symptoms I would take a watchful waiting approach to this.