Neuroendocrine tumors (NETs) are a diverse group of tumors that arise from neuroendocrine cells, which are found throughout the body. These cells produce hormones and are involved in regulating various bodily functions. NETs can occur in different organs, including the pancreas, lungs, and gastrointestinal tract, and can be either benign or malignant. Symptoms of NETs vary depending on their location and hormone production. Some common symptoms include abdominal pain, flushing, and changes in bowel habits. Diagnosis typically involves imaging tests, blood tests, and sometimes a biopsy. Treatment options may include surgery, chemotherapy, and targeted therapies, depending on the tumor's type and stage.