Dreams

Not sure where to post this as it's not really controversial, but this is the most active room so...

Say you have a dream about someone you haven't seen in a while, but the dream isn't positive (in this case said person was dealing with a health problem that you don't think is going on in real life) do you casually mention it as like a heads up, or leave it alone because it's not real life and might be weird, or make said person worry?

Edit: my dreams have come true numerous times in the past.