stressor

[stres-er, -awr]
noun
an activity, event, or other stimulus that causes stress.

Origin:
1950–55; stress + -or2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stressor (ˈstrɛsə)
 
n
an event, experience, etc, that causes stress

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
During stress, vagal tone decreases, allowing the heart to speed up and the body to handle the stressor.
Often the symptoms of this disorder come on rapidly and without an identifiable stressor.
If you can't identify and remove the stressor, you may need to seek professional help.
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