Re: finger twitch
Okay, it's reaching a great deal to read symptoms on the Internet and assume that what you are experiencing is identical.
Also, I'm uncertain where you're obtaining your information, but several clarifications need to be identified here. First of all, the web-space between the thumb and index becomes severely atrophied in ALS and MND patients, generall more pronounced with limb-onset versus bulbar-onset, whereas the "twitching" you refer to is known as fasciculation and doesn't actually occur in one localized spot but actually all along the nerves of the entire limb such that they can either be observed spontanously or made visible through percussion of the skin tissues with a reflex hammer. Lastly, the fasciculations are not intermittent but rather constant and represent increasing loss of communication between the nerves and tissues. That's because ALS/MND is a gross degenerative disease of the nerves and it doesn't happen in isolation from other symptoms.
The single greatest error made by persons in reading medical information is that they make general assumptions in the absence of necessary medical information to understand "why" symptoms occur. They also make these assumptions in the direct absence of having observed patients with the actual disease to be able to discern a clear difference in benign versus pathological symptoms. It may interest you to know that many medical students undergo a phase of medical student syndrome during their training because they are exposed to illness on daily basis. They develop a misconception that disease in general is proliferent and begin measuring patient symptoms against their own, becoming fearful that they have contracted the diseases they are treating. It passes with time.
It's important not to try and make illogical assumptions and in the absence of medical training, it's unwarranted to attempt self-comparisons. While it's certainly prudent to educate yourself, even encouraged, you must take care not to become convinced that you understand the implications of disease symptoms without knowing the intimate details.
You'll be fine.
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Best regards and Good Health