Psychology says people who get irritated at times on even small issues aren't necessarily angry at the person or event in front of them. A reaction to a minor problem can sometimes come from stress that has built up over time. Work pressure, lack of sleep, emotional strain and mental exhaustion can reduce a person's ability to handle frustration. In such situations, a small event may become the point where emotions come out. This does not mean every irritated reaction has the same cause. However, understanding the reasons behind irritation can help people recognise stress, pause before reacting and take steps to manage their emotional energy.
