When someone says, 'I feel really bad, but I don't know why,' do they actually know the reason deep down, or do they truly not know it?

When someone says, I feel really bad, but I dont know why, do they actually know the reason deep down, or do they truly not know it?
When someone says, 'I feel really bad, but I don't know why,' do they actually know the reason deep down, or do they truly not know it?
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