Alexithymia is not a disorder. It is not listed as a diagnosis in any major psychiatric manual, including the DSM-5 or ICD-11. Instead, it is classified as a personality trait, one that involves difficulty identifying your own emotions, trouble describing those emotions to others, and a thinking style that focuses outward on external events rather than inward on feelings. Somewhere between 8% and 23% of the general population has it, depending on how and where it’s measured.
That said, calling it “just a trait” undersells how significantly it can affect daily life. Alexithymia is tied to a wide range of physical and mental health problems, and people who score high on it often struggle in relationships, therapy, and situations that require emotional awareness. Understanding what it is, where it comes from, and how it’s managed matters, even without a formal diagnosis code.
Why It’s Classified as a Trait, Not a Diagnosis
Alexithymia describes a pattern of thinking, feeling, and relating to other people rather than a discrete illness with a clear boundary between “has it” and “doesn’t.” Researchers call it a “transdiagnostic construct,” meaning it cuts across many different conditions rather than standing alone. You can score high on alexithymia and also have depression, PTSD, an eating disorder, autism, or chronic pain. You can also score high and have no psychiatric diagnosis at all.
This is part of the reason it hasn’t been added to the diagnostic manuals. It behaves more like a dimension of personality, similar to how introversion or neuroticism exist on a spectrum, than like a condition you either have or don’t. The formal definition, developed in the 1970s by researchers Nemiah, Freyberger, and Sifneos, centers on four features: difficulty identifying your feelings, difficulty distinguishing emotions from physical sensations in your body, difficulty putting feelings into words for other people, and a limited capacity for imagination or fantasy.
How Alexithymia Is Measured
The most widely used tool is the Toronto Alexithymia Scale (TAS-20), a 20-item self-report questionnaire. It measures three dimensions: difficulty identifying feelings (7 items), difficulty describing feelings (5 items), and externally oriented thinking (8 items). Each item is scored on a scale, and the total determines where you fall.
A score of 51 or below is considered non-alexithymic. A score between 52 and 60 falls into a “possible alexithymia” range. A score of 61 or higher meets the threshold for alexithymia. These cutoffs are used in research and clinical settings, but because alexithymia isn’t a formal diagnosis, there’s no official “you have it” moment the way there would be for a condition like major depression.
Primary vs. Secondary Alexithymia
Not all alexithymia looks the same or comes from the same place. Researchers distinguish between two main types, and the difference has real implications for whether it can improve over time.
Primary alexithymia is developmental. It takes shape during childhood and early adulthood, potentially driven by genetics, early trauma, or disrupted attachment with caregivers. It functions as a relatively stable personality trait and tends to be more resistant to therapy. People with primary alexithymia may have never had strong emotional awareness to begin with.
Secondary alexithymia develops later in life as a reaction to something else: psychological trauma, extreme stress, brain injury, stroke, or other neurological damage. Because it represents a loss of emotional processing that was once present, it tends to respond better to treatment. Think of it this way: primary alexithymia acts as a vulnerability factor that may contribute to mental illness, while secondary alexithymia is more often a consequence of illness or injury.
What Happens in the Brain
Brain imaging studies reveal that alexithymia involves disrupted activity across several regions responsible for processing and understanding emotions, not just one isolated area.
The amygdala, which normally responds strongly to emotional stimuli, shows reduced activation in people with high alexithymia scores. This dampened response occurs during both conscious and unconscious emotional processing, which helps explain why emotions can feel muted or absent.
The insula, a region that maps bodily sensations and converts them into conscious feelings, behaves in a particularly interesting way. It becomes overactive when people with alexithymia experience emotions directly but underactive when they’re asked to think about emotions or empathize with someone else. This mismatch may explain a common paradox: feeling physically overwhelmed by an emotion you can’t name or describe.
The anterior cingulate cortex, a key hub for emotional self-awareness, also appears to be disconnected from the brain’s internal signaling systems in alexithymia. One hypothesis, called the “blindfeel” model, proposes that emotional information from the body fails to reach the cortical regions that would normally make it conscious. The emotion is happening in your body, but the signal never fully registers as a feeling you can recognize.
Reduced activity in the prefrontal cortex, particularly its lower and middle portions, underlies problems recognizing emotions in other people’s faces, limited emotional imagination, and difficulty using gut feelings to guide decisions. Research also shows that the broader communication between brain networks, not just individual regions, is altered at rest in people with high alexithymia.
Overlap With Autism
Alexithymia and autism frequently co-occur. Between 65% and 85% of autistic adults meet criteria for alexithymia, compared to roughly 10% to 15% of the general population. Relatives of autistic individuals also show higher rates. This overlap is significant enough that researchers have spent years trying to untangle which social and emotional difficulties stem from autism itself and which are better explained by co-occurring alexithymia.
The two are distinct constructs, though. Autism involves broader differences in social communication and behavior patterns, while alexithymia specifically targets emotional identification and expression. An autistic person without alexithymia may understand their own emotions perfectly well but struggle to navigate social expectations. A non-autistic person with alexithymia may function smoothly in social situations while having very little awareness of what they’re actually feeling.
Physical Health Connections
Because alexithymia involves difficulty distinguishing emotions from bodily sensations, it has a well-documented connection to physical symptoms. When you can’t identify anger, grief, or anxiety as emotions, those states of arousal don’t simply disappear. They often get expressed through the body instead: chronic stomach problems, fatigue, unexplained pain, or other somatic complaints. Research has found significant relationships between alexithymia and psychosomatic disorders, with some sex differences in how gastrointestinal symptoms, energy levels, and physical functioning are affected.
This isn’t about imagining symptoms. The physical experiences are real. The issue is that the emotional component driving them remains invisible to the person experiencing them, making both the emotions and the physical symptoms harder to treat.
How Alexithymia Is Managed
Because it isn’t a formal diagnosis, there’s no standard treatment protocol for alexithymia. But therapeutic approaches that focus specifically on identifying, sharing, and understanding feelings have shown the most benefit.
Group therapy appears to be particularly effective. In a group setting, people with alexithymia can observe how others express emotions, receive feedback on their own communication, and practice sharing feelings in a lower-stakes environment. Watching someone else articulate a feeling you’ve never been able to name can be a breakthrough moment that’s hard to replicate in one-on-one therapy.
For individual therapy, approaches that involve an active, empathetic therapist and a strong therapeutic relationship tend to work better than highly structured or confrontational methods. A therapist who names emotions gently, mirrors back what they observe, and builds trust over time gives someone with alexithymia a kind of emotional translation they may never have had. Primary alexithymia, the lifelong developmental type, tends to respond more slowly and with more difficulty than secondary alexithymia, which often improves as the underlying trauma or medical condition is addressed.
The practical takeaway is that alexithymia is real, measurable, and consequential for both mental and physical health. It shapes how you experience emotions, how you relate to others, and how your body handles stress. It just isn’t, technically, a disorder.