This "things" happen to you and me when we feel stressed. We know that unmanaged stress is not good but we still unclear why it is not good. Come come let us see what negative effects can we get if we do not manage our stress well.
During stressful state, our heart rate is increasing more than normal. This will lead to our increasing breathing rate. At this time our muscle will become tense and do you know why your hand become cold? It's because of the blood will moves to your muscle as a preparation for fight. This will lead to less blood at your brain and this is why stress people will become uncreative and hard to think. Blood pressure will increase because of the increasing heart pump rate and this makes us easily gets angry. Sometime we mad becuse of simple little thing.
In terms of your stuffs inside your mind, you may feel:
The effects of stress to people's behaviour are hyper attitude where they tend to move faster than normal people. They conduct frequent gestures that can be obviously seen by people. They also becoming impatient especially if others do work slower than them.