Cancerous visceral pain is very common in patients. Patients often lack a clear expression of the nature of the pain, but it is more uncomfortable. Visceral pain is not caused exclusively by internal organs, visceral pain is not associated with internal injuries, visceral pain is often involved in other areas, and the pain is diffuse and not easily localized. Visceral pain can be a concomitant symptom of strong motor and autonomic reflexes. All forms of visceral pain are vaguely localized, and most patients feel a significantly larger area of pain than the original visceral area. Moreover, when the pain is intense, the area of the torso where the pain is felt is larger. This suggests that the representative areas of visceral organs in the central nervous system are not very precise. The pathogenic factors originate from the thorax, abdomen, and visceral organs, and the localization is not clear, often accompanied by autonomic dysfunction, such as profuse sweating, etc. The nature of the pain is acute and chronic dull pain, colic, distension, etc., which may radiate to the distant body surface, i.e., involvement pain, often accompanied by symptoms of various systems, commonly caused by cancer compression of blood vessels, nerves, fascia, intestinal canal causing organ ischemia, invasion of the thorax, peritoneum, liver, pancreatic metastasis causing peritoneal tension, etc.