Responding to stress in the way described above is a very positive thing. In fact, it is essential. Without a stress response, the T. Rex would probably eat us. But, when you think about it, how many times in most of our lives are we stressed because a T. Rex (or any predator, for that matter) is going to eat us? We are much more likely to be stressed by ongoing non-physical worries. Social relationships, performance in school or at work, the unknown of trying something new; these are the things that are likely to stress us on a daily basis. These are also situations in which an increased heart rate or more blood flow to your muscles are not particularly useful at all. In these cases, known as chronic stress (because it lasts for a long time), the stress response can actually be very bad for you.

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Go to source: https://kids.frontiersin.org/article/10.3389/frym.2019.00095