Muscle weakness vs muscle fatigue

I think for the benefit of people who are in the midst of diagnosis, it's time to put out a discussion on what weakness really is. On the internet there are 2 kinds of weakness, true weakness and perceived weakness. You can have either one, but I believe that doesn't discount the fact that weakness itself is present. Here comes the confusion. True weakness is defined by the inability to

perform basic functions such as lifting your hand etc. Perceived

weakness is the feeling you get when you find yourself unable to lift

your hand for a long period. Both are weaknesses. But the latter is due to fatigue (as so they say).

It only gets more confusing. If you do have progressive muscle weakness, you'll find yourself slowly unable to work those muscles, setting fatigue in very easily. 

Discussion point is: How would one know if their muscles are fatigued due to weakness or are weak due to fatigue ? Is there a subtle difference between those 2? This will definitely help people to tell the doctor more specific details so that correct tests can be performed. 

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