Sorry, hope that didn't panic you, but I was very hungry with both of mine, went from feeling a bit peckish to starving in nanoseconds.
Another time I find I am very hungry is when we've just been on holiday or away with work and been eating a lot more than usual and do struggle when I get back to eating more normal amounts.
It could also be stomach acid. And no doubt several other potential causes, hopefully there'll be some other posters for you.