My AMI spotted an umbilical hernia and recommended I have it operated on before my next class one. Reason being it could be a problem during a depressurisation? It was very small and on seeing my GP he was somewhat bemussed as to why! Anyway, an appointment with a specialist was arranged, op done and out within a day. All I have now is a small scar.
On my next medical he went straight for my belly button to see if it had been done!