Also,there may be emotional changes, like feeling depressed or worried.

VOA: special.2009.04.07

What it feels like to you when you're worried or depressed or joyful or in love.

当你担心时,就会产生烦恼的体验,或是沮丧,或是愉悦,或是坠入爱河

耶鲁公开课 - 死亡课程节选

The difference between the extremely happy people and extremely unhappy people is not that one gets sad, of upset, or anxious, or depressed; and the other does not.

极其快乐的人和极其不快乐的人,区别不是在于一个会伤心，难过，焦虑或抑郁;,而另一个不会。

哈佛公开课 - 幸福课课程节选