There are a lot of theories as to why this is so, many of them focusing on the increases in inflammation that stress can bring, when the body's sympathetic nervous system maintains the "fight or flight" reaction for too long without releasing action.

Many of us have reported this--take a look at Wings' postings on the subject, and this one that Melody just posted:

http://neurotalk.psychcentral.com/sh...t=28467&page=3