The onset of depression is not uncommon in all age groups, from high school students to the elderly, which means that it can develop at every age and should be taken seriously. Most people with depression are introverted, timid and indecisive, and these people are not good at communicating with others. In terms of physiological changes, women are prone to depression when they are pregnant because the concentration of estrogen in their bodies is significantly higher, along with changes in hormone levels. Depression is also related to introversion. Introverted people are not good at expressing their inner thoughts and are not very independent. When they encounter difficulties, they tend to close themselves off and will not solve problems rationally and become depressed. Smarter people have a tendency to be perfectionist, sometimes harsher on themselves, and have high self-esteem, and are also prone to depression when under pressure at work.