Bad Clutch?

[JBeck]

Recently it seems like no matter how easy I am on the clutch, the truck wont start off smooth or shift smooth. It has 78000 miles on it and probably the original clutch. There are some times though that it does just fine but usually not. It doesnt jump or stall out or anything its just not as smooth as it was a few months ago. Is this a problem with the clutch itself or something else. What and how can I check to see what might be causing this?
Thanks

 

[rleister]

Could be low fluid to the master cylinder, is clutch releasr right on the floor? could be air in the master cylinder.