Sorry, you're wrong.

FACT:"Stress can trigger a cold."

Surveys show that stress can double the risk of colds. However, why is it that we often seem to get a cold or flu after the worry has passed? The reason for this may lie with our ancestors, the hunter gatherers, who couldn't afford to be weakened by illness when danger threatened. Their bodies would go into 'overdrive'; only succumbing to the infection when the danger had passed.