Maybe the start of a new year is a good time to state a bit of the bleedin' obvious, in order to fend off formal "New Year Resolutions."
Stress, as any engineer will tell you, is an essential property of well-made things like bridges and buildings. Clifton suspension bridge would land up in the Avon gorge were it not subject to the "right" levels of stress. People likewise. No stress = disintegration. People often comment in surprise how peaceful a dead body looks.
Too much stress in the wrong places and structures collapse. If you park end-to-end battle tanks on the Clifton Bridge....
Ditto for people, then. We tend to use the word as a shorthand for something like "destructive levels of anxiety," or "unacceptable tensions."
Granny's Obvious but Essential Points About Stress: