Visceral pain threshold (VPT)

Visceral pain threshold represents the minimum intensity of a stimulus applied to internal organs—such as the esophagus, stomach, or colon—that is perceived as painful by an individual. It is a physiological measurement rather than a single molecular target, though it is governed by a complex network of receptors and ion channels including TRPV1, Nav1.7, and various opioid receptors [2][3]. In many clinical conditions, particularly functional gastrointestinal disorders like irritable bowel syndrome (IBS), patients exhibit a decreased visceral pain threshold, a state known as visceral hypersensitivity [1]. This hypersensitivity leads to significant morbidity as normal physiological processes, like digestion, are perceived as painful. Therapeutic strategies focus on increasing this threshold by targeting peripheral afferent signaling or central processing pathways to provide symptomatic relief [3][4].

Other names

Visceral sensitivityNociceptive thresholdVisceral hypersensitivitySensory threshold

Drugs modulate this threshold by acting on specific molecular targets such as guanylate cyclase-C (GC-C), opioid receptors, or ion channels (e.g., calcium or sodium channels) to reduce the excitability of visceral afferent nerves [1][2].