Try this: Go to your .minecraft, Then open Options.txt in wordpad and look for the line "heldItemTooltips:true" if it says that only false change it to true. If it says true and you are still having issues I don't know what it might be.
EDIT: If you have optifine go to video settings and then click details then look at held item tooltips and see if it's disabled.
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Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie. One Ring to rule them all, One Ring to find them, One Ring to bring them all, and in the darkness bind them,
In the Land of Mordor where the Shadows lie
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EDIT: If you have optifine go to video settings and then click details then look at held item tooltips and see if it's disabled.
Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all, and in the darkness bind them,
In the Land of Mordor where the Shadows lie
"The only way to do great work is to love what you do" - Steve Jobs
Like them? Post on them! Say your opinion, or suggest more features!