I kinda get your point, but you have to see it this way: Both of them had it themselves almost certainly at some point in their lives. Haemorrhoids are kinda common. But it’s not something you tell your peers about while having a break next to the coffee machine.

Also, don’t be embarrassed about medical issues in front of your parents. If they aren’t complete assholes, they won’t turn this into a show to shame you or something.