Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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Epiphenomemon has two distinct menaings.
* 1) A secondary phenomenon that results from and accompanies another.
* 2) ''Pathology''. An additional symptom or condition or symptom in the course of a disease, not necessarily connected with the disease. 

In the first sense, it is a side-effect or by-product, that is, there is a causal relationship between the secondary phenomenon and the first.

In the second sense, the medical meaning, there is no such relationship.
A doctor might ask a patient whom he is treating for a disease ," Have you noticed any new epiphenomena?"

(Well, mine do!!!)

Source: ''The American Heritage Dictionary of the English Language.'' 3rd ed.