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Can a non-invasive vagus nerve stimulation treatment help adults with chronic mild traumatic brain injury and PTSD?

limited confidence  ·  Last reviewed May 21, 2026

Non-invasive vagus nerve stimulation (nVNS) is a treatment that uses a device to send mild electrical pulses to the vagus nerve through the skin. It is being studied for conditions like traumatic brain injury (TBI) and post-traumatic stress disorder (PTSD). For adults with both chronic mild TBI and PTSD, early research suggests nVNS may help reduce symptoms, but the evidence is still limited and more studies are needed.

What the research says

A 2026 retrospective subgroup analysis looked at adults with chronic mild TBI symptoms who also had PTSD (based on a high PTSD checklist score). They were treated with adjunctive nVNS (added to their usual care) for 3-4 months. The study found that nVNS was associated with a significant reduction in overall symptom burden, as measured by the Neurobehavioral Symptom Inventory 410. This suggests nVNS may help with the overlapping symptoms of TBI and PTSD.

Another 2025 study tested different settings of transcutaneous vagus nerve stimulation (tVNS) in veterans with PTSD, some of whom also had mild TBI. The researchers found that a specific combination of settings (20 Hz frequency, 100 microsecond pulse width, and 80% discomfort threshold) improved slow wave sleep and next-day startle response compared to sham stimulation 9. This indicates that the way nVNS is delivered may matter for its effects.

However, these studies have limitations. The first was a retrospective analysis, not a randomized trial, so it cannot prove cause and effect 410. The second was small (21 veterans) and focused on sleep and autonomic function, not overall PTSD or TBI symptoms 9. More rigorous studies are needed to confirm whether nVNS is truly effective for this specific group.

What to ask your doctor

  • Could non-invasive vagus nerve stimulation be an option for my chronic mild TBI and PTSD symptoms?
  • What does the current research say about the benefits and risks of nVNS for my condition?
  • Are there any clinical trials or specialists in my area who offer nVNS treatment?
  • How does nVNS compare with other treatments I am already using or considering?
  • What side effects or discomfort should I expect if I try nVNS?

This question is drawn from common patient questions about Neurology and answered using cited medical research. We do not provide individualized advice.