Can’t anyone have these diagnostic criteria?

It certainly seems like everyone has had bad sleep habits or poor appetite at some time in their lives. However, to be diagnosed with unipolar major depression, sad feelings or loss of interest in life have to be present along with several specific physical and mental symptoms at the same time (see Appendix B). These depressed symptoms must be severe enough that they interfere with your normal work, school, family, and social life. If this sounds like you, you may have unipolar major depression.