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When I turn the faucet to hot, the water stops running. Valves have been checked and I have hot water everywhere else.

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did this just all of a sudden happen or where you gradually making your shower hotter to get it to a medium temperature? – DMoore Jul 10 '13 at 18:02
What type of faucet? – bib Jul 10 '13 at 18:23
Does it first get warm/hot and then turn off? What happens if you open the valve part-way? – Steven Jul 10 '13 at 18:35

Very small pieces of debris (very frequently rust chips in homes with older galvanized pipes) can block one side or the other of the cartridge of a shower valve.

Newer valves have replaceable cartridges than can be examined and cleaned. Just shutoff the water, open and close the valve to relieve pressure and undo the trim plate.

Note, examples are of Delta shower valves

The Cartridge is usually behind a finely threaded retaining nut (bonnet nut).

enter image description here

Sometimes the seals break and jam.. here's a Delta cartridge and seals enter image description here

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