Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Emergency warning signs should not wait for a follow-up appointment.
Sudden severe headache, severe chest or back pain, fainting, stroke-like symptoms, or a suddenly cold and painful limb require immediate emergency care.
Routine follow-up is important even when an aneurysm causes no symptoms.
Keep scheduled imaging appointments and, when possible, use the same imaging method and center so measurements can be compared accurately.
After endovascular or open repair, follow-up may include imaging and checks of the incision, circulation, blood pressure, kidney function, or implanted graft.
Endovascular repairs often require long-term imaging because leaks or device-related changes may develop without obvious symptoms.
Routine care may also include support to stop smoking and management of blood pressure, cholesterol, diabetes, and other cardiovascular risks.
Family members should not assume they need screening, but they can ask their clinicians whether the aneurysm type or family history makes screening appropriate.
The article also says
Ask how large the aneurysm is, how it was measured, and when the next scan is due.
Contact the treating clinician before that visit if new persistent pain, new nerve-related symptoms, or a noticeable change in health develops.
Every sign above is quoted from the sofidex article on Aneurysm. If you are not sure, err upward — it is always reasonable to be checked.