Plumbing Questions? Ask a Plumbing Expert.
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How many handles does your shower valve/faucet have ? 1? 2? 3? what type of piping do you have connected to the shower valve?faucet? copper? galvanized? any galvanized piping in the house?
Ok, the 2 most likely possibilities are either a clogged shower head or clogged piping. Try unscrewing the shower head then check if you have any flow out of the shower arm (the pipe the head screws onto) with the head removed. If you still don't have any flow I suspect you have galvanized piping that is clogged with rust. The only fix for that is new piping. The fix for the first problem is a new shower head if you have flow with the head removed.