Region: US | Usage example: Try not to sweat the small stuff during the redesign.

Sweat the small stuff

Meaning

Worry about minor details unnecessarily.

Used to advise focusing on bigger priorities.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Physical exertion metaphor about sweating over small issues.

Gained popularity in self-help literature from the 1980s.