Not necessarily.  On the other hand, if you do need an operation, it is much, much better to have a planned (elective) procedure than an emergency one.  The important thing is to see your GP, to be referred to an aortic specialist and to make sure that you are seen regularly so that the rate of enlargement of your aneurysm can be assessed.  If you do end up needing surgery, this is increasingly possible using minimally invasive ('keyhole') techniques using stents that avoid the need for big operation.