An allergic reaction to a banana isn't very common, but it does
happen. Some people are allergic to the form of protein contained
in the banana. Additionally, if you're allergic to the banana, you
could also be allergic to watermelon, cantaloupe kiwi, avocado and
chestnuts and latex. Some people aren't actually allergic to
bananas, they're allergic to the gas used to ripen bananas.