Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services immediately.
Contact the treating clinician promptly if there is new or worsening abdominal, back, side, or groin pain, even if a scan is already scheduled.
The clinician can decide whether earlier imaging is needed.
And for anyone, someone who:
Routine follow-up is essential for both unrepaired and repaired aneurysms.
For an aneurysm under surveillance, follow-up usually includes imaging, review of symptoms, blood pressure care, smoking status, and management of cardiovascular risk.
After open repair, imaging is usually less frequent, but long-term follow-up remains important because other areas of the aorta can sometimes enlarge.
Routine follow-up includes scheduled appointments, stable symptoms, and planned imaging.
Sudden severe pain, fainting, confusion, profound weakness, or cold and clammy skin is not a routine follow-up issue.
The article also says
After EVAR, lifelong imaging is generally required to check the stent graft and aneurysm sac.
The exact schedule and type of imaging depend on the device and earlier results.
Every sign above is quoted from the sofidex article on Abdominal aortic aneurysm. If you are not sure, err upward — it is always reasonable to be checked.