Why Do People Get Stressed About Small Things?

Imagine you're eating your favorite snack, and suddenly a fly lands on it. That little fly might not seem like much, but it can make you feel annoyed or even stressed out for the rest of the day. It's like when small things in life, like missing a bus or spilling coffee, get our brains all worked up, even though they don't matter that much. Scientists think this happens because our brain is used to dealing with big problems, and sometimes it overreacts to little ones.