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Welcome to The Dr. Kumar Discovery, a health and wellness podcast hosted by Dr. Ravi Kumar, a board-certified neurosurgeon. This is the medical podcast for anyone who wants honest, evidence-based answers to the health questions that matter most. No corporate influence. Just a physician who reads the research, questions the dogma, and breaks it down in plain language so you can make better decisions about your own health.
Dr. Kumar is a practicing neurosurgeon who brings a surgeon's precision to topics most doctor podcasts only scratch the surface of. Each episode dives deep into the science behind metabolic health, cardiovascular disease, heart disease, hormones, nutrition, brain health, mental health, pain, inflammation, weight loss, aging, blood pressure, sleep, and longevity. Whether it's the truth about seed oils, the real data on GLP-1 drugs and weight loss, the science of cold water therapy, how light can heal the body, or why your testosterone is declining, Dr. Kumar goes straight to the peer-reviewed literature and tells you what the evidence actually shows, not what the headlines say. This is evidence-based medicine in plain English.
The show features three formats. Solo deep dives explore a single health topic from the ground up, covering everything from the biology to the practical takeaways you can use today. Expert interviews bring on leading researchers, clinicians, and forward-thinking voices in health and medicine for in-depth conversations you won't hear anywhere else. The Tribulations series tells the true stories behind medicine's greatest breakthroughs, from the discovery of penicillin to the invention of vaccines to a father's fight to save his son's life. These are the stories of the doctors, scientists, and patients who changed the course of medicine.
Topics covered on the show include testosterone and hormone optimization, sleep science, photobiomodulation and red light therapy, exercise with oxygen therapy, creatine, uric acid and gout prevention, gut health and probiotics, cardiovascular risk and Lp(a), cholesterol, PANDAS in children, PTSD and trauma, acetaminophen safety, glyphosate, foot health, and much more.
If you're tired of generic health advice and want to hear from a neurosurgeon who actually reads the studies, The Dr. Kumar Discovery is your podcast. New episodes drop regularly. Subscribe and join the discovery.
For show notes, references, and more, visit drkumardiscovery.com/podcast
"Hey folks, Dr. Kumar here. Earlier this week, I interviewed Dr. Trey Tippens on PTSD and about many of the treatments that are genuinely changing this field. And I got a lot of really thoughtful questions from you guys. So I picked five of the best ones to do some mini deep dives on. I think this will tie together most of what we covered earlier in the week.
Question 1: Why can’t people with PTSD just remind themselves they’re safe?
Okay, so the first question is: Why can’t people with PTSD just remind themselves they’re safe? If they know logically that they’re home, why doesn’t that help?
Well, this one seems obvious from the outside, but it’s actually one of the most important things to understand about PTSD. And that is that the rational mind and the fear response don’t run on the same circuit in the brain. When a threat is detected, whether real or perceived, the amygdala fires first. It fires fast, and it fires before your thinking brain even has a chance to weigh in. So by the time your prefrontal cortex starts firing—and this is the part of the brain that could tell you "hey look, you’re fine, you’re at home, everything’s good"—the alarm bell that was sounded by the amygdala has already been sounded, and you’re in fight or flight.
In people with PTSD, the literature suggests this problem is compounded neuroanatomically. What I mean by that is that neuroimaging research has consistently found that the ventromedial prefrontal cortex—the region that’s responsible for regulating the amygdala and putting the brakes on the fear response—shows reduced activation in PTSD patients compared to control patients. So it’s not that the person is being irrational. It’s that the biology of their threat response system has become dysregulated in a very specific and well-documented way. The rational mind isn’t losing because the person’s weak, it’s losing because the circuit that’s supposed to let it win, like it does in most normal people, has been structurally compromised. That’s why saying "just calm down" to someone with PTSD is about as useful as telling someone with a broken leg to "just walk it off."
Question 2: Why would a nerve block in the neck help with PTSD?
Okay, so the next question: You mentioned the stellate ganglion block. Isn’t that a pain procedure? Why would a nerve block in the neck help with PTSD?
And this is a great question and this one caught me a little off guard the first time I really dug into it too, because you’re right, the stellate ganglion block has been used in anesthesia and pain management for decades. But the application to PTSD is based on a pretty elegant piece of logic. The stellate ganglion is a cluster of sympathetic nerves sitting at the base of the neck right here, right around the first thoracic and lower cervical vertebrae. The sympathetic nervous system is your fight or flight system. And in people with PTSD, that system is running on overdrive.
Blocking that stellate ganglion temporarily quiets the sympathetic chain, which interrupts the hyperarousal that makes traditional PTSD therapy so hard to tolerate. The evidence is actually solid on this point. A randomized sham-controlled clinical trial in JAMA Psychiatry in 2020 enrolled 113 active duty service members and found that two stellate ganglion block injections, given two weeks apart, produced significantly greater reduction in PTSD symptoms at eight weeks compared to a sham procedure. Where this gets really interesting, as Dr. Tippens described, is when the block is used as a springboard into therapy rather than a standalone treatment. Lowering someone’s baseline hyperarousal enough that they can actually sit through prolonged exposure without shutting down is a fundamentally different use case than just getting a periodic shot to manage symptoms. That combination approach may turn out to be where the real long-term benefit lies.
Question 3: What is the actual science behind MDMA helping PTSD?
Okay, next question: What is the actual science behind MDMA helping PTSD? And wasn’t the FDA approval rejected?
Okay, another good question. And to answer the FDA question first: yes, it was rejected. But that doesn’t mean it doesn’t work. Okay, so let me explain this to you. MDMA works partly by flooding the brain with serotonin, oxytocin, and norepinephrine all at once. The result of having this chemical change in your brain happen when you’re in a therapeutic setting with trained guides is that you have a state of heightened emotional openness and reduced fear that allows you to revisit traumatic memories without the usual overwhelming emotional response. It’s not that the memories go away. It’s that the brain can process it from a less defended place, which is exactly what the exposure-based therapies that we talked about in the main episode are trying to do, but in a much more arduous mental environment.
The clinical results have been striking. The first Phase 3 trial published in Nature Medicine in 2021 found that 67% of participants receiving MDMA-assisted therapy no longer met diagnostic criteria for PTSD after just three sessions. And compare that to the 32% in the placebo group. A second Phase 3 trial published in Nature Medicine in 2023 replicated these findings, with 71% losing the PTSD diagnosis in the treatment group versus 48% in the placebo group. These are large effect sizes, especially when compared to what we typically see in psychiatric treatment trials.
Now, the FDA did decline to approve MDMA-assisted therapy in August of 2024. The rejection was not primarily out of efficacy. It was about the blinding problem, which we touched on in the episode. Because MDMA produces an obvious subjective experience, participants know whether they’ve received the drug or the placebo, which makes it nearly impossible to run a truly blinded trial. The concern is that expectancy—that's what you expect and believe—could be creating some therapeutic effect, rather than the drug doing that itself. That’s a legitimate scientific question, and it’s one the field is working to answer. But I’ll say this: even if part of the benefit is expectation-driven, 67 to 71% no longer meeting PTSD criteria after just three sessions is a benchmark that traditional therapy has not come close to matching after years of treatment. The story on MDMA is just getting started, and it’s super exciting.
Question 4: Can trauma actually be passed down from parents to children through biology?
Okay, next question: Can trauma actually be passed down from parents to children through biology? Or is it just a psychological idea?
Okay, so this one surprised me when I went back and looked at the literature because it sounds like something that’s wild and theoretical, right? But the data is real. There are two distinct transmission pathways here, and they’re both documented. The first is prenatal chemical exposure. So when a pregnant woman has PTSD or is experiencing active trauma during pregnancy, her body is producing elevated levels of cortisol, adrenaline, and other stress hormones. The developing fetus is bathed in those chemicals. And there’s now good evidence that this alters the expression of genes involved in stress regulation in a child’s brain.
A study published in 2021 examined children of women who had experienced sexual violence and torture during the Kosovo war. 72% of those women had PTSD symptoms during pregnancy, and their children showed higher cortisol levels and differential DNA methylation at genes involved in glucocorticoid stress responses. So these are the same genes that regulate how sensitively the body reacts to stress. The children hadn’t experienced any trauma themselves, but the changes were transmitted through the in-utero environment.
So the second pathway is behavioral modeling, and it’s just as powerful. Parents who have unresolved trauma develop behaviors that communicate to a child that the world is unsafe. Vigilance, avoidance, emotional reactivity—those patterns get internalized by a child as normal and adaptive. They grow up calibrated to a threat level that doesn’t match their actual environment, just like their parents. So the takeaway is important. If you’re a parent and you’re carrying unresolved trauma, getting help is not just for you. The earlier trauma is addressed in the parent and in the child, the more completely those patterns can be interrupted. Children’s brains especially are neurologically plastic in a way that adults are not, and that’s an opportunity that offers hope with early intervention.
Question 5: Is there real evidence for post-traumatic growth?
Okay, so last question: Dr. Tippens mentioned post-traumatic growth. Is there real evidence that people come out of PTSD stronger, or is that just something we say to make people feel better?
Well, maybe it’s a little bit of that, but I hear you on this one. We often hear the phrase 'what doesn’t kill you makes you stronger,' and maybe that is to make you feel better about some pain that you experienced in the past. But in terms of PTSD, it turns out to be real, based on the literature and based on the research. So post-traumatic growth, which is a really cool name for the recovery from PTSD, refers to the positive psychological change that emerges as a result of the struggle with highly challenging life circumstances, like trauma. It’s not the same as resilience, which is about bouncing back when you get knocked down. Growth, or post-traumatic growth, is about coming out differently with new perspectives, deeper relationships, a revised sense of what’s possible, and often a changed sense of personal strength.
A couple of researchers named Tedeschi and Calhoun, who coined this term in the 1990s, developed a validated scale to measure it. And studies across populations including combat veterans, cancer survivors, sexual assault survivors have consistently found that many people report meaningful growth following trauma. So the basic concept is that a person’s prior worldview was actually challenged hard enough with the trauma that it had to be rebuilt in a more resilient model. And as Dr. Tippens put it, some people describe it as putting steel in their souls. And that was very poetic, but it actually maps out to what the literature describes as a fundamental reorganization of identity and meaning-making in the aftermath of trauma.
None of this means trauma is something we need to seek out or that people who don’t experience growth after trauma are failing somehow. People heal at their own pace and in their own way. But the data does say clearly that PTSD is not a permanent destination. Recovery is possible, growth is possible, and the goal isn’t to get you back to who you were before the trauma. It’s to become someone who has integrated the experience into a fuller, more honest understanding of what life is.
Okay, so that’s it folks. I hope this helps you or someone you love understand trauma better and have hope for a happier tomorrow, because it’s definitely possible and it’s definitely out there for you. Okay, cheers, and I’ll see you next week."