Neuroendocrine tumors are a heterogeneous group of tumors that originate from peptidergic neurons and neuroendocrine cells in the body. First of all, we should know that it is different from what we usually call cancer. Medically, malignant tumors originated from epithelial tissues are called cancer, while neuroendocrine tumors originate from neuroendocrine cells; the tumors we call cancer are generally of high malignancy, and people are afraid of talking about cancer. While neuroendocrine tumors refer to a group of cells, they can exist in locations such as lung, stomach, colorectum, liver, etc. Compared with other types of cancer, these tumors grow relatively slowly compared to cancer, and their nature varies from nearly benign to highly malignant, and there are great differences in treatment and prognosis. Early symptoms of neuroendocrine tumors are atypical, and a variety of symptoms such as flushing, diarrhea, and abdominal cramps are often incorrectly attributed to other lesions. It is estimated that neuroendocrine tumors take about 5-7 years from the time of occurrence to clinical diagnosis. 50% of neuroendocrine tumors are already locally invasive or advanced by the time of clinical diagnosis. It is crucial to raise the awareness of this disease and strive for early diagnosis and treatment.