MENS HEALTH : Sweaty palms lately , while holding pen ?

I m 21 yr old guy ... lately I ve been having sweaty palms lately and mostly when I am nervous , thinking over something , or usually when holding pen ...
When I hold pen , the cusp formed causes heat on the palms and then they get wet with sweat , not that sweat dribbles , but I can sweat shining on my palms and mostly this happens on rigt hand only !
why does this happen ?
 
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