Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
These changes may require earlier testing or a treatment adjustment, but they are not always an emergency.
Seek urgent or emergency care for fainting, severe breathing difficulty, chest pain, confusion, signs of severe dehydration, rapidly worsening swelling with breathlessness, or a sudden severe episode involving major blood pressure or heart-rate changes.
Routine follow-up monitors both the tumor and the effects of hormone release.
The schedule depends on the tumor’s location, grade, treatment, disease extent, symptoms, and previous test results.
There is no single follow-up schedule that fits everyone.
Contact the care team between routine visits for a clear increase in diarrhea or flushing, new wheezing, ongoing vomiting, reduced urine output, unplanned weight loss, new leg swelling, increasing abdominal size, or declining ability to exercise.
The article also says
Visits may include a symptom review, physical examination, blood or urine testing, and CT, MRI, or receptor-based imaging.
Heart monitoring may include NT-proBNP testing and repeat echocardiograms when clinically appropriate.
Every sign above is quoted from the sofidex article on Carcinoid syndrome. If you are not sure, err upward — it is always reasonable to be checked.