Stress is not inherently evil or bad for you. It’s a biological response designed to help us successfully escape threats. In an ideal world, your body responds to stress then returns to its normal state.
But in a less-than-ideal world (say, a world where work emails keep your phone buzzing til 10 p.m.), stress can become chronic rather than temporary. That’s when it can start to negatively impact your health.
https://www.businessinsider.sg/health-effects-of-stress-2017-8