Depression comes with a number of symptoms that that cause a certain level of impairment in your day to day functioning. I talk about what it means to have functional impairment in this video on What is a Normal Depression?    • Feeling Depressed vs Having Depressio...  

So anyone of these symptoms in isolation doesn’t establish depression. Instead, the way to think of it is people with depression usually have one of these symptoms along with several other symptoms like sleep problems, irritability, inability to enjoy things, trouble focusing, etc.

References
McGlinchey JB, Zimmerman M, Young D, Chelminski I. Diagnosing major depressive disorder VIII: are some symptoms better than others? J Nerv Ment Dis. 2006 Oct;194(10):785-90.

Liu RT, Kleiman EM, Nestor BA, Cheek SM. The Hopelessness Theory of Depression: A Quarter Century in Review. Clin Psychol (New York). 2015;22(4):345-365.


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