Hi, Renee -
It would be easier to answer your question if you could provide more information. Have you been diagnosed with some form of depression? Has this been going on for a while? Did it start in response to any specific event? One symptom of depression can be sadness and crying that seems to come out of nowhere. Depression for some people also comes and goes in cycles - or it may not be depression at all. Do you have any other symptoms that concern you?
Knowing more would enable us to be more helpful.
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