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 or stroke-like symptoms require emergency care rather than waiting for a routine appointment.
Contact the care team promptly for new seizures, changing headaches, new weakness or numbness, speech or vision changes, increasing pain or swelling, or new bleeding from a body AVM.
Follow-up depends on whether the AVM is being observed or treated.
Routine appointments may include a symptom review, neurological examination, discussion of medicines, and repeat imaging.
Keep copies of imaging reports when possible, especially if care is provided by more than one medical center.
Follow-up is especially important after radiosurgery because vessel closure is gradual.
The article also says
After treatment, imaging is used to determine whether abnormal blood flow remains.
A catheter angiogram may be needed because MRI or CT does not always show the smallest remaining vessels.
Attend scheduled visits even when you feel well.
Ask before making major changes to physical activity, pregnancy plans, or medicines.
There is no single activity restriction that applies to everyone with an AVM.
General cardiovascular care, including avoiding tobacco and managing diagnosed high blood pressure, supports overall health but cannot guarantee that an AVM will not bleed.
Every sign above is quoted from the sofidex article on Arteriovenous malformation. If you are not sure, err upward — it is always reasonable to be checked.