What does MS weakness And fatigue feel like?

What does real clinical weakness mean vs perceived weakness? I am scared I might have MS.

Like for a long time now my right arm and leg have “felt” tired and weak, but when I go to test them by lifting weights or running I can do everything normally. I am definitely over concentrating on them and always feel the need to test my ability to use them. But is this true weakness or just in my head/ perceived weakness.

bin_tenn said:

Agreed, clinical weakness is very apparent. The simplest of tasks require much more effort, if they can even be done at all. Of course there are varying degrees of clinical weakness, but there is definitely still a huge difference between clinical and perceived.

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thank you!
so is perceived weakness just in your head??