Vagus Nerve Review Explores Today's Science, Tomorrow's Therapies

UC San Diego researchers synthesize the complex mechanisms behind vagus nerve modulation and its potential to treat a wide range of conditions.

Published on Mar. 6, 2026

Got story updates? Submit your updates here. ›

A new review paper published in Comprehensive Physiology by UC San Diego researchers provides a comprehensive overview of vagus nerve modulation, a medical intervention approved by the FDA to treat conditions like epilepsy, stroke, depression, and more. The paper examines the complex network of mechanisms and therapeutic approaches associated with the vagus nerve, as well as the challenges of individual variability in patient response.

Why it matters

Vagus nerve modulation represents a non-drug option or add-on therapy that aims to change the underlying nerve signals driving disease symptoms. Understanding the mechanisms behind these therapies is crucial to developing more targeted and effective treatments for a wide range of conditions.

The details

The review paper, led by recent UC San Diego PhD graduate Troy (Yifeng) Bu, synthesizes hundreds of studies on how vagus nerve stimulation and modulation can influence brain circuits, the immune system, and organ function. The authors identify a lack of standardization in parameters like frequency, strength, and location of stimulation across approved devices, making it difficult to compare studies. They also highlight the challenge of individual variability in patient anatomy, autonomic nervous system function, and comorbidities, which can impact how someone responds to vagus nerve therapy.

  • The review paper was published on March 6, 2026.

The players

Troy (Yifeng) Bu

A recent PhD graduate from the UC San Diego Department of Electrical and Computer Engineering, UC San Diego Qualcomm Institute affiliate, and director of design engineering for InflammaSense.

Imanuel Lerman, MD

Professor of anesthesiology at UC San Diego School of Medicine, affiliate of UC San Diego Qualcomm Institute and VA San Diego Healthcare System, and co-founder and CEO of InflammaSense.

UC San Diego School of Medicine

The medical school at the University of California, San Diego.

UC San Diego Qualcomm Institute

An interdisciplinary research center at the University of California, San Diego.

VA San Diego Healthcare System

A healthcare system operated by the United States Department of Veterans Affairs, located in San Diego, California.

Got photos? Submit your photos here. ›

What they’re saying

“There are now hundreds of papers talking about different mechanisms — how stimulating or blocking the vagus nerve modulates brain circuits, the immune system and organ systems like the heart, lungs and kidneys.”

— Troy (Yifeng) Bu, Recent PhD graduate, UC San Diego Department of Electrical and Computer Engineering (Mirage News)

“The paper identifies the most important discoveries and groups from the literature. It also tells the story of how the government, including DARPA, funded this work early on with the ElectRx program that, with follow-on agency funding via the NIH SPARC initiative, spurred this huge panoply of different treatments and therapeutics.”

— Imanuel Lerman, MD, Professor of anesthesiology, UC San Diego School of Medicine (Mirage News)

“Patients are going to be very different. People's anatomy is different, and their network systems at the level of brain processing and peripheral nerve activity are different. There's heterogeneity in their autonomic set points and in thresholds required for stimulating certain fibers within the vagus. Comorbid diseases, such as COPD, heart disease and mental health disorders, change how a patient's autonomic nervous system responds to stress and how it regulates inflammation. All of these factors matter in vagus nerve stimulation.”

— Imanuel Lerman, MD, Professor of anesthesiology, UC San Diego School of Medicine (Mirage News)

What’s next

The authors suggest that one potential solution to the problem of individual variability is the development of self-regulating "closed loop" systems that can adjust vagus nerve stimulation based on real-time biometric feedback from the patient. They also identify opportunities to advance the field through the use of artificial intelligence to optimize stimulation parameters and predict responders.

The takeaway

This comprehensive review highlights the complex mechanisms underlying vagus nerve modulation and the challenges of developing effective, personalized therapies. By synthesizing the current state of the science, the authors provide a framework to guide future research and the creation of next-generation vagus nerve treatments tailored to individual patients and their specific conditions.