Astrain on ones body or mind is called?

Answer; a stressor
hopefully i helped :))

A strain on ones body or mind is called stress.

Stress is "pressure or tension exerted on a material object"

Synonyms for stress are: pressure, tension, worry, strain, trouble, difficulty, and/or hassle.

I hope this helped! I put this in my own words except for the definition which I got from goggle.com

Mri or anything that has uv lights