neuroendocrine cancer
Neuroendocrine cells are spread throughout the human body, but are mainly found in the small intestine, pancreas, and lung bronchioles. Neuroendocrine cells act like nerve cells in that they receive messages from the nervous system; they can also release small molecules that circulate throughout the body and work like hormones. High levels of these hormone-like substances can cause symptoms such as flushing or diarrhea.
https://uihc.org/health-topics/what-neuroendocrine-cancer
You know a lot about this topic.
I’d never heard about that release of molecules that may circulate and work like hormones. The wrong kind of doctor may mistake symptoms of flushing and diarrhea for other maladies. “I have just the solution for you, Mrs. Johnson, Pepto Bismal! Flush your problems away!”