I remember DW's supposed uterine cancer - turned out to be fibroids apparently. She also claimed to be pregnant with twins a few years back, which she then miscarried. I don't think that was true either- and pregnancy loss is devastating, it devalues people's genuine grief.
Someone on my facebook, not a celeb, posted about having chest pain and what should he do? Loads of people suggested a glass of milk, some Gaviscon/Rennies/Peptac. One person suggested A&E. It turned out to be costochondritis but if it had been a heart attack, he was wasting valuable time, posting online about his symptoms, the head.