Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for a seizure lasting several minutes, loss of consciousness, sudden severe weakness, inability to walk, severe breathing or swallowing difficulty, or a sudden intense headache with repeated vomiting or confusion.
And for anyone, someone who:
Contact the care team promptly for a noticeable change in hearing, new facial weakness or numbness, worsening balance, persistent vomiting, new weakness, increasing pain, vision changes, or new bladder or bowel problems.
Sudden hearing loss should receive urgent medical assessment because prompt evaluation may identify causes other than tumor growth that are time-sensitive.
And for anyone, someone who:
Long-term follow-up is essential because new tumors can appear and existing tumors can change.
The schedule should be individualized according to age, symptoms, previous treatment, tumor burden, and genetic findings.
Routine follow-up may include neurological examinations, hearing and speech-understanding tests, brain MRI, spinal imaging, eye examinations, and review of balance, pain, mobility, communication, and daily function.
People receiving medicine or recovering from surgery may need additional testing.
The article also says
Genetic counseling can help relatives understand whether testing is appropriate.
It can also explain reproductive options without directing a person toward any particular choice.
Psychological support, hearing-loss services, school or workplace accommodations, and patient support organizations may be useful parts of ongoing care.
Every sign above is quoted from the sofidex article on Bilateral acoustic neurofibromatosis. If you are not sure, err upward — it is always reasonable to be checked.