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The only thing that could cause the onset of a cold is over-training...so be careful not to over do it!
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I disagree strongly with this. The only thing that can cause the onset of a cold is a virus and your immune system being overwhelmed by it.
The biggest thing that lowers your immune system's guard is stress... and that can be caused by a ton of different things, including but definitely not limited to overtraining.
And sometimes, as with anything else, **** just happens and you get a big initial dose of virus from someone. (Ask the parents of small children just in school, also known as plague vectors.) The dance between pathogens and hosts is chaotic, and only controllable up to a certain point.