Thank you for the good topic!
I agree about telling the person if it is life or death or even something else that is serious. Even if they don't do anything, then at least you tried.
About 20 yrs. ago, before I understood that I was an empath, there were two times when I picked up upcoming deaths that possibly could have been prevented, but I'd just met the person, my husband was doing work for both of them, and I was afraid it would reflect on him if they thought his wife was some kind of a nut case.
One died 3 weeks after I met him, the other one year after I met her, both of the illnesses that I had picked up previously.
I later had a long talk with the wife of the man who died and his wife said he would not have listened, that he was stubborn and once he decided something, that was it. (He committed suicide). That helped a bit, but I still felt like a bad person for not trying, especially given my being a psychiatric social worker.
In the other case, I later learned the woman was a believer in such abilities and would have been totally open to what I was saying and maybe her cancer could have been caught early enough. I've never stopped feeling guilty about that one.
I hear people say they turn off their ability to read people and never tell them and I think why were we given this ability, if not to use it? I will never not tell someone something important I see again, even if they think I'm a complete boob. Just my opinion.
However, when it comes to relatively unimportant stuff, I find if I tell them they are about to jump into a swimming pool with no water in terms of a relationship, investment, etc., I find they will usually do it anyway, and afterwards, will kill the messenger (me). Every time they see me, it reminds them of how stupid they were and they lash out. So, now I let them keep their unnecessary dramas if they want them that badly.