Nausea

nausea and vomiting, conditioned taste aversion, behavioral defense … Once the association is made, subsequent exposure to the environmental feature may result in immediate nausea and defensive avoidance behaviors.

Porges positions nausea as the primary expressive output of the dorsal vagal complex, arguing that it can be rapidly conditioned to environmental cues and thereafter function as an automatic defensive-avoidance trigger.

Porges, Stephen W., The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation, 2011thesis

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Nausea is another example. The enteric nervous system is a major tributary to the vagus nerve, the main conduit of signals from the abdominal viscera to the brain.

Damasio identifies nausea as a paradigmatic instance of enteric-nervous-system signalling relayed via the vagus, illustrating how gut-brain communication shapes the global feeling-tone of well-being.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018thesis

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nausea and the accompanying disgust appropriately signal, both to oneself and to others, that an ingested substance should not be eaten. However, this response is counterproductive (even detrimental) when it is someone's persistent pattern of engaging with food that is not tainted.

Levine argues that nausea-disgust is a biologically adaptive signal that becomes pathological when its triggering is decoupled from genuine threat, as occurs in trauma-conditioned aversion.

Levine, Peter A., In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness, 2010thesis

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one widely touted 'satiety agent' called cholecystokinin (CCK) … has been found, upon close analysis, to reduce food intake by causing gastrointestinal distress, transmitted up to the brain via the vagus nerve, rather than a natural feeling of satiety.

Panksepp demonstrates that what presents behaviourally as satiety may in fact be nausea transmitted via vagal afferents, underscoring the epistemic difficulty of distinguishing aversive visceral signals from genuine homeostatic regulation.

Panksepp, Jaak, Affective Neuroscience The Foundations of Human and Animal, 1998supporting

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Common side effects include nausea, vomiting, decreased appetite, headache, dizziness, fatigue, somnolence, and anxiety.

In the pharmacotherapy literature, nausea is catalogued as the characteristic adverse effect profile of naltrexone, situating it as a clinically managed iatrogenic signal rather than a psychodynamically meaningful one.

McPheeters, Melissa, Pharmacotherapy for Adults With Alcohol Use Disorder in Outpatient Settings: Systematic Review, 2023supporting

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Trials of naltrexone found higher likelihood of dizziness, insomnia, nausea, and vomiting.

Systematic review evidence quantifies nausea as a significantly elevated risk in naltrexone trials relative to placebo, framing it as a pharmacodynamic liability with real-world adherence consequences.

McPheeters, Melissa, Pharmacotherapy for Adults With Alcohol Use Disorder in Outpatient Settings: Systematic Review, 2023supporting

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Nausea 3 696 0.73 0.46 to 1.14 0.0 3.7 to 16.5 0.8 to 10.4

Meta-analytic data show no statistically significant difference in nausea rates between topiramate and placebo groups, distinguishing topiramate's adverse-event profile from that of naltrexone.

McPheeters, Melissa, Pharmacotherapy for Adults With Alcohol Use Disorder in Outpatient Settings: Systematic Review, 2023aside

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Figure E-81. Topiramate versus placebo: Nausea by risk-of-bias rating

A forest-plot figure in the systematic review disaggregates nausea incidence by risk-of-bias rating across topiramate trials, providing methodological granularity for the adverse-event assessment.

McPheeters, Melissa, Pharmacotherapy for Adults With Alcohol Use Disorder in Outpatient Settings: Systematic Review, 2023aside

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