Why PTSD and chronic pain so often travel together

Many trauma survivors carry two burdens at once. There is the memory, with its nightmares, startle, and vigilance. And there is the body: a back that never healed right after the accident, headaches that began after an assault, widespread aches that no scan explains. People often get treated for one while the other is quietly left out of the conversation.

The research suggests this is not a coincidence. A 2017 meta-analysis in Frontiers in Psychiatry by Siqveland and colleagues pooled 21 studies and estimated that about 9.7% of people with chronic pain also met criteria for PTSD. The rate was higher in clinical settings, at 11.7%, and higher still, at 20.5%, among people with chronic widespread pain. The authors noted wide variation between studies, so these are estimates, not fixed numbers. Still, the pattern is consistent with what pain and trauma clinicians see every day, and it is one reason our trauma and grief program asks about pain as a matter of routine.

The mutual maintenance model: how each condition feeds the other

In 2001, Sharp and Harvey published a review in Clinical Psychology Review that shaped how the field thinks about this overlap. They concluded that chronic pain and PTSD are “mutually maintaining conditions” and described several pathways by which one keeps the other going.

The practical takeaway is that treating only one side of the loop may leave the other side pulling it back. That does not mean one treatment can fix both. It means a plan that acknowledges both tends to make more sense.

Where ketamine fits: one receptor system, two problems

Ketamine works mainly by blocking NMDA receptors, which respond to glutamate, the brain’s main excitatory messenger. That same receptor system shows up in both halves of the story.

On the pain side, NMDA receptors are central to central sensitization, the process by which the spinal cord and brain turn up the volume on pain signals until ordinary sensations hurt and pain outlasts the original injury. Blocking these receptors is thought to be one reason ketamine can reduce pain in some people whose pain no longer responds well to standard medications.

On the trauma side, researchers think ketamine’s glutamate surge and downstream effects may support neuroplasticity, the brain’s capacity to form new connections, in circuits affected by chronic stress. That remains an active area of research rather than a settled explanation. What matters for patients is the overlap: a single medicine acts on a system implicated in both conditions. That is a reason for interest, not proof of a double benefit.

What the research shows for PTSD

Ketamine is FDA-approved as an anesthetic; its use for PTSD and for chronic pain is off-label. The PTSD evidence is younger than the depression evidence, but it comes from controlled trials.

A 2014 randomized crossover trial in JAMA Psychiatry by Feder and colleagues gave 41 people with chronic PTSD a single infusion of ketamine or midazolam, an active placebo. Ketamine was associated with a significant, rapid reduction in PTSD symptoms 24 hours later. A 2021 follow-up by the same group in the American Journal of Psychiatry tested six infusions over two weeks in 30 patients. At week two, clinician-rated PTSD scores were 11.88 points lower in the ketamine group, 67% met the response threshold compared with 20% on midazolam, and responders kept their response for a median of 27.5 days. Our article on ketamine for PTSD covers these trials in more depth.

What the research shows for chronic pain

The pain literature is larger but more uneven. A 2019 systematic review and meta-analysis in Anesthesia & Analgesia by Orhurhu and colleagues pooled seven randomized controlled trials with 211 patients. Pain scores were about 1.83 points lower on a 0–10 scale with ketamine for up to two weeks after infusion, and in the trials that reported it, 51.3% of ketamine patients responded compared with 19.4% on placebo. The authors also noted that most of the included studies were at high risk of bias, so the effect should be read as promising but modest.

The 2018 consensus guidelines from the American Society of Regional Anesthesia and Pain Medicine, the American Academy of Pain Medicine, and the American Society of Anesthesiologists, published in Regional Anesthesia and Pain Medicine (Cohen and colleagues), reached a similar view. They concluded that evidence supports ketamine for chronic pain, but that its strength varies by condition and dose, and that higher doses and more frequent infusions carry greater risk. For condition-specific detail, see ketamine for chronic pain and ketamine for fibromyalgia.

A reassuring signal from burn care

A common worry is that a dissociative medicine might make trauma worse, especially for someone whose pain began with a violent or frightening event. One study offers some reassurance. In a 2014 analysis in Military Medicine, McGhee and colleagues reviewed 289 U.S. service members treated for burns. The 189 who received ketamine during surgery had more severe injuries on average, yet they screened positive for PTSD at a similar rate, about 24% versus 27%, with no significant difference.

That was a retrospective study of surgical anesthesia, not a trial of ketamine as a PTSD treatment, and it does not show a protective effect. It does suggest that ketamine exposure in a medically traumatized population was not linked to more PTSD. If you want to understand the difference between ketamine’s dissociation and a true flashback, read can ketamine cause flashbacks?

What to expect at Music City Ketamine

When pain and trauma overlap, the first conversation is about priorities. Some patients mainly want relief from nightmares and hypervigilance; others mainly want to get through a workday with less pain. Protocols differ: research on PTSD has typically used shorter infusions, while pain protocols can involve longer ones. We choose together, based on your history, your goals, and your other providers’ input.

We follow the principles in our trauma-informed care approach. You do not have to tell us your trauma story, and you choose the music, the eye mask, the lighting, and a stop signal before the first infusion. We review every medication, including opioids, muscle relaxants, and sleep aids, and coordinate with your prescribers; our guide to ketamine and medication interactions explains why that matters. Marla Peterson, CRNA, oversees every infusion, and a clinician is in the room with anesthesia-level monitoring of oxygen levels, blood pressure, and heart rate throughout. You can read more about what a CRNA is.

For trauma presentations, we generally recommend having a therapist in place, since the weeks after an infusion series can be a useful time for trauma-focused or pain-focused therapy. Our guide to finding an integration therapist in Tennessee is a practical starting point. Veterans may also find ketamine for veterans useful.

Honest expectations

Ketamine is not a cure for either condition, and it does not replace physical therapy, trauma-focused psychotherapy, or the care of your pain specialist. Some people respond strongly, some partially, and some not at all. The trials above studied PTSD and chronic pain separately, so any benefit across both conditions at once is a reasonable hypothesis, not an established result. Effects may fade over weeks, and people who respond often discuss maintenance infusions.

Cost is real, too. Standard infusions are $475 per session, and extended pain infusions are priced by length; our ketamine therapy cost page lists every tier. Insurance generally does not cover off-label ketamine. For more on each condition, see our PTSD and chronic pain pages.