Depending on the type of NET, a person may experience the following tumor-related symptoms or signs: General cancer symptoms: Fatigue. Loss of appetite. Unexplained weight loss. Symptoms related to the tumor size and/or location: Persistent pain in a specific area. Thickening or a lump in any part of the body. Nausea or vomiting
https://www.cancer.net/cancer-types/neuroendocrine-tumors/symptoms-and-signs

