13. Somatostatinomas
The chemical somatostatin, which is a chemical that helps naturally regulate hormones. When your hormones are out of whack you can have a multitude of symptoms associated with many other issues including nausea, diarrhea, stomach pain, and jaundice, but many of the symptoms don’t present themselves until advanced stages. Usually, when doctors diagnose this type of tumor it has already spread to surrounding areas such as the liver.