Poor Water Pressure at Tub/Shower

My daughter lives in a condo (out of state) and has hardly any water flow in the tub and shower. Her sink and kitchen pressure is OK and she says her neighbors don't have a problem. I'm thinking the problem might be with the tub valve since flow is OK elsewhere. Pipe is galvanized. Will appreciate suggestions.
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Either the galvanized pipe is clogged, or the vale is not letting water pass. If it is a cartridge type of valve, just replace the cartridge. Or clean out something clogging it.
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Odds are the galvanized pipe is part of the problem. However, you may be right about the tub/shower valving. There should be an access panel behind it where you can check for ordinary things like a crimped line before getting into the valve assembly. Ask if there is a local hard water problem.
Joe
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You don't say if this is a new problem, or if she has always had this problem.
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Is it a single lever shower faucet? Usually the cartidges could get sticky or plugged up.
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