I know someone who does this all the time and she is very irritating. She is an alpha mum type, and I know her from a local mother and toddler group. There are about 10 of us that are friends from the group, and we all meet up regularly with the DC and have mums' nights out.
She always has to have things far worse than anyone else does. Initially it was PND. Several of us in the group, myself included, had it, but somehow she decided hers was far worse than anyone else's, and somehow managed to get the sympathy and attention of the whole group of friends, whilst anyone else with PND was overlooked and basically made to feel that we were lucky as we "hadn't had PND as bad as poor X". This woman also has private healthcare insurance, so she went to see a private psychiatrist, and basically I feel that often with private care you get told whatever you want to hear, as obviously it keeps you paying if you get good treatment. And the private consultant was happy to confirm that her PND was "severe" even though she generally seemed perfectly fine. I'm not saying she didn't have PND by the way, just that I don't think it was any worse than anyone else's.
Now it's the same with her child. If ever anyone else's child is unwell, hers is always far worse. She takes him to see a private GP if her GP doesn't say what she wants to hear. I posted a facebook status a few days ago about my son having a cold, and she replied saying her son was far worse, he had tonsillitis, and that I was lucky it was only a cold. His teething was apparently far worse than the teething that anyone else's child has gone through. Giving birth was apparently far more painful both times that she has gone through it than it has been for anyone else.
She just really annoys me. I can't avoid her unfortunately as we all often meet up, but I just find her so attention seeking.