Why would cold water run up through a shower pan even though there is no drain blockage?

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Do you have an upstairs tenant or the sewer is backing up.
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Sounds crazy but it is true. My bathroom sink fills up when you run hot water and drains slowly but drains fast when you run cold water. Does anyone know why Thanks?

Answer . FIX IT!!!!!!!!!!!!!!!!!!!!!. 7/3/09 -- Above "answer" not helpful.. I also am experiencing same symptoms, but with newly installed sink-bowl. Trap, etc. all CLEA

What does it mean if your toliet is clogged and water is coming up through the tub and shower drain?

It means that your main drain line is clogged downstream from where your drain from your tub ties into your toilet drain and the problem can be a hundred of different reasons.