MDD tends to be cyclic, where a person suffering from it has periods where they want to do little (anhedonia), feel extremely sad outside of a direct cause and potentially actually move and interact with the world slowly. It tends to recur, and in the time between episodes, they might not be happy per-se, but are less affected. MDD is just one of a large number of depressive and mood disorders, and while it tends to be what people think of when referring to “depression,” there are things like dysthimia that are less periodic.
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