Because Spock is a Vulcan, which means they do not express emotion. (They go through some sort of ritual where the emotions are supressed so they won't get out of control) i think pain falls into the same category but only to an extent.
Tuvok on Star Trek: Voyager was full-blooded Vulcan though (Spock's only 1/2) so there was no way any emotion would slip through like it occasionally did with Spock.
The only time Vulcans express emotion is during their mating ritual. i cannot spell the term but that's what it means.
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