Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Sudden severe headache, seizure, fainting, new weakness, trouble speaking, or marked confusion requires emergency care rather than waiting for a routine appointment.
Follow-up plans are tailored to the aneurysm and the treatment used.
A person with an observed aneurysm may need periodic imaging to look for growth or a change in shape.
There is no single imaging schedule that is right for every patient.
Routine appointments may address blood pressure, smoking, recurring headaches, medication questions, and emotional health.
After a hemorrhage, follow-up may also include physical, occupational, speech, or cognitive rehabilitation.
The article also says
After clipping or endovascular treatment, imaging may be used to confirm that the aneurysm remains closed and the nearby artery stays open.
Some devices require longer-term monitoring.
People treated with a stent or flow diverter may also receive antiplatelet medicine to reduce clot formation; it is important not to stop this medicine without advice from the treating team.
Contact the treating clinician for new but nonemergency symptoms, increasing headaches, medication side effects, or questions about activity.
Every sign above is quoted from the sofidex article on Brain aneurysm. If you are not sure, err upward — it is always reasonable to be checked.