The Inflamed Brain in Psychiatric Disorders
A new study reveals immuno-inflammatory markers in psychiatric disorders.
Posted January 5, 2026 | Reviewed by Abigail Fagan
Not all depression , bipolar disorder , or schizophrenia is the same. A recent study published in Biological Psychiatry identified a distinct subtype of psychiatric illness marked by brain inflammation, one that cuts across traditional diagnoses and may explain why standard treatments fail for some people (Tang et al., 2025). This new brain imaging study offers an interesting clue. It turns out that across different psychiatric disorders, some people show clear signs of brain inflammation, visible on scans and confirmed through immune system tests. This isn't just a theory; it's being seen in real people, in real clinics. Researchers are now searching for a biological fingerprint that clearly identifies people whose symptoms are rooted in brain inflammation.
The research team brought together hundreds of teens and adults living with major depression, bipolar disorder, or schizophrenia. They gathered three layers of information: (1) brain scans to see how different regions talk to each other when the mind is at rest; (2) blood tests searching for markers that tell us how active the immune system is; and (3) more bloodwork, checking for classic signs of inflammation in the balance of white blood cells.
Two Distinct Biological Profiles
One group stood out immediately. Their brains and bloodwork showed unmistakable signs of inflammation: immune system activation, a specific brain network pattern, and a distinct biological profile. The researchers called this the "immunoinflammatory biotype". This fits with what some researchers have been suggesting for years: for a subset of people, depression is more than a mood circuit misfiring. The fatigue, the brain fog , the loss of appetite , the physical aches, these very real burdens may be the body’s way of signaling, might be the immune system’s call for help. The other group, despite having the same diagnoses on paper, didn’t show these inflammatory markers. Their brains and immune systems looked typical.
What's Happening in the Inflamed Brain
People with the inflammatory profile showed differences in how their brain networks functioned, especially in areas involved in visual processing and higher-order thinking. These brain network differences consistently matched up with changes in the immune system that were found in blood tests. Inflammation shapes how we feel, think, and experience the world. That could help explain the brain fog, the sensitivity to light and sound, the emotional flatness, and maybe why some people just don’t respond to standard treatments, no matter how hard they try.
Clinically, people with the inflamed brain type often found that standard psychiatric medications didn’t bring relief. Their depression, anxiety , mania , and psychosis symptoms clung on stubbornly, leaving them searching for answers and for hope. This echoes other research linking inflammation to poor antidepressant response. But until now, identifying these patients with typical blood tests has been nearly impossible. For so many, it’s been a story of frustration, of trying treatment after treatment with little change. This study points toward a future where brain scans and immune panels might help clinicians see the whole person and figure out who needs something beyond the usual approach, something more tailored to their unique biology and story.
Toward Immune and Neuroimmune-Informed Care
Imagine if, instead of just asking, "What’s your diagnosis?" clinicians could ask, "What’s happening in your body that might be shaping your experience?" That’s the promise here: treatment matched to each person’s biology and life, not a list of symptoms. For people with an inflammatory profile, that might mean targeting the immune system directly, or maybe even anti-inflammatory treatments in the future. It’s also a reminder that conventional psychiatric medications may only go so far if underlying inflammation goes unaddressed. Our daily routines matter. Chronic stress , poor sleep, sitting too much, and processed foods can all fuel inflammation. Small changes, such as addressing sleep, moving our bodies, and eating an anti-inflammatory diet , can help lower that inflammatory burden.
For clinicians and therapists working with people who haven’t responded to standard treatments, this research offers both a challenge and a new sense of possibility. It asks us to look wider, to consider that what seems like psychological resistance might sometimes be rooted in neuroinflammation. This means making room for the idea that healing sometimes means listening to what’s happening in the immune system, in the gut, in the signals running through every cell. Just as cancer treatment is becoming more personalized, mental health care is also moving toward individualized medical approaches. The future will draw on new research about neuroimmunity and neuroinflammation, especially for people with complicated symptoms that don't respond to typical treatments.
Gertel Kraybill, O. (2025). Depression could be linked to your immune system. Psychology Today. https://www.psychologytoday.com/us/blog/expressive-trauma-integration/202512/depression-could-be-linked-to-your-immune-system
Tang, L., Gong, X., Wei, X., Tang, R., Ren, Y., Zhao, P., Xie, C., Cheng, W., Zhu, R., Tang, Y., Zhang, X., & Wang, F. (2025). Identification and validation of immuno-inflammatory neuroimaging markers across major psychiatric disorders. Biological Psychiatry. https://doi.org/10.1016/j.biopsych.2025.10.004
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Odelya Gertel Kraybill, PhD, LCPC, is a psychoneuroimmunology and trauma therapist, scholar, and neurodivergent parenting expert.
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This article is part of the Bringwise Psychology Journal — daily insights on human behavior, mental health, and personal growth.