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 severe breathing difficulty, sudden inability to swallow saliva, major bleeding, fainting, a seizure, new confusion, or sudden weakness on one side.
Contact the oncology team promptly for a growing neck mass, new hoarseness, worsening cough, fever during treatment, difficulty keeping down fluids, increasing pain, or changes in breathing or swallowing.
Do not wait for the next routine appointment.
Follow-up is usually more frequent than for slower-growing thyroid cancers.
The schedule depends on disease extent, treatment, symptoms, and how quickly the cancer is changing.
After surgery or radiation, follow-up may address voice changes, thyroid hormone replacement, calcium levels, nutrition, and rehabilitation.
And for anyone, someone who:
The article also says
Visits may include a neck examination, review of breathing and swallowing, blood tests, and CT or other imaging.
Targeted therapy, chemotherapy, and immunotherapy require monitoring for treatment-specific effects.
Keep copies of pathology, imaging, and molecular test reports and an updated medication list.
Advance care planning can identify who should make decisions if you cannot speak for yourself and which treatments fit your values.
Every sign above is quoted from the sofidex article on Anaplastic thyroid cancer. If you are not sure, err upward — it is always reasonable to be checked.