People lack empathy for a wide range of reasons, from how their brains are wired to what they experienced in childhood to conditions that make it hard to read their own emotions. Empathy isn’t a single switch that’s either on or off. It’s built from multiple brain systems, shaped by genetics and environment, and it can be dulled, damaged, or simply underdeveloped. Understanding the specific reasons helps explain why some people consistently struggle to share or recognize what others feel.
Two Types of Empathy, Two Ways It Breaks Down
Empathy has two distinct components. Cognitive empathy is the ability to understand what someone else is thinking or feeling, essentially perspective-taking. Affective empathy is the ability to actually share in another person’s emotional state, to feel a pang of distress when you see someone in pain. These rely on different brain circuits, which means a person can lose one while keeping the other. Someone with narcissistic traits, for example, may understand exactly what you’re feeling (cognitive empathy intact) but simply not care (affective empathy impaired). Someone with autism may deeply feel others’ emotions but struggle to read social cues that signal what those emotions are.
The Brain Regions Behind Empathy
Several brain structures work together to produce empathic responses. The insula, a region buried deep in the brain’s folds, acts as a hub for integrating what’s happening in your body with emotional input from the outside world. It helps you map someone else’s experience onto your own internal state. The prefrontal cortex, particularly its medial section, handles the more deliberate work of imagining another person’s perspective. The amygdala processes emotional significance, and damage to it can reduce how much attention a person pays to emotional cues like the expression in someone’s eyes.
A network connecting the superior temporal sulcus and the sensorimotor cortex also plays a role. Activity across this distributed system predicts how accurately a person can read what someone else is feeling. When any part of this network is underdeveloped, damaged, or poorly connected, empathy suffers.
Brain Injuries Can Erase Empathy Overnight
One of the starkest demonstrations of empathy’s biological basis comes from people who lose it suddenly after a stroke or head injury. The right hemisphere of the brain has long been considered especially important for basic emotion recognition, and right-hemisphere damage frequently impairs a person’s ability to read facial expressions and take others’ perspectives. Patients with right-hemisphere strokes often show reduced fixation on people’s eyes, which is one of the primary channels for reading emotion. They also struggle with “theory of mind,” the capacity to understand that other people have thoughts and feelings different from their own.
Left-hemisphere damage can also reduce what researchers call empathic accuracy, the ability to correctly identify what someone else is feeling in real time. The takeaway is that empathy depends on physical brain tissue. When that tissue is damaged, empathy can vanish in someone who previously had plenty of it, with no change in their character or intentions.
Genetics Set the Baseline
Your genes influence how empathic you naturally tend to be. One of the most studied genetic factors involves variations in the oxytocin receptor gene. Oxytocin is a hormone closely tied to bonding, trust, and social connection, and small differences in its receptor gene affect how strongly the oxytocin system operates. A large study of healthy volunteers found that a specific variation (called rs53576) was significantly associated with overall empathy scores, with people carrying two copies of the G version scoring higher in emotional empathic concern than those with other combinations.
Interestingly, this genetic effect was significant in women but not in men, hinting at a biological reason why empathy levels differ between sexes on average. But the oxytocin receptor is just one piece. Researchers have identified variations in at least ten other genes that influence empathy, including genes involved in serotonin transport, dopamine receptors, and other hormonal pathways. Empathy is polygenic, meaning no single gene determines it. Instead, many small genetic influences combine and interact with a person’s environment.
Childhood Neglect Rewires Empathic Responses
Early childhood experiences are one of the most powerful shapers of empathy, and emotional neglect is particularly damaging. When caregivers consistently fail to meet a child’s basic emotional needs (love, belonging, nurturance, support), the child’s developing brain adapts in ways that blunt empathic responses later in life. Neglected children tend to develop insecure attachment styles, negative internal processing patterns, inhibited emotional responses to others, and impaired ability to regulate their own emotions. All of these contribute to empathic impairment.
Research using brain-wave measurements has shown this effect directly. Adults who experienced childhood emotional neglect show a measurably reduced neural response when witnessing someone else in pain, compared to people who weren’t neglected. The specific brain signal affected is an early-stage response tied to emotional sharing, the initial “feeling with” another person that happens within milliseconds. This suggests that neglect doesn’t just make people less willing to empathize; it alters the automatic, pre-conscious neural machinery that makes empathy possible in the first place. The damage happens during adolescence, when the brain is still developing its social circuitry, and it carries into adulthood.
When You Can’t Read Your Own Emotions
Some people struggle with empathy not because they don’t care about others, but because they can’t identify what they themselves are feeling. This trait is called alexithymia, and it affects roughly 10% of the general population. People with alexithymia have difficulty putting their emotions into words, distinguishing between physical sensations and feelings, or understanding why they feel a certain way.
The connection to empathy is straightforward: to share in someone else’s emotional experience, you first need to generate and recognize a matching feeling in yourself. If you can’t interpret your own internal states, you lose the raw material empathy is built from. In one study, people with high alexithymia looked at faces showing pain and consistently rated the person as experiencing less pain than other observers did. Their difficulty perceiving their own feelings literally blunted their perception of others’ feelings.
Alexithymia also helps explain empathy deficits in other conditions. It mediates the link between psychopathic traits and low empathy, and between criminal aggression and low empathy. In many cases, what looks like callousness may partly be an inability to process emotional information rather than a deliberate choice to ignore it.
Personality Disorders and Empathy
Certain personality disorders are defined in part by empathy impairment, but the nature of that impairment varies. In antisocial personality disorder (which overlaps with psychopathy), people often understand others’ emotions perfectly well but lack the affective response that would make them care. They can read the room but feel no pull to respond to suffering. In narcissistic personality disorder, empathy is impaired differently. People with strong narcissistic traits tend to be so focused on their own needs and self-image that they fail to attend to others’ emotional states. They’re not necessarily incapable of empathy; they simply don’t allocate attention to it.
These distinctions matter because they suggest different underlying mechanisms. Psychopathy involves a deeper deficit in the brain’s emotional circuitry. Narcissism involves more of an attentional and motivational problem. Both result in behavior that looks unempathic from the outside, but the internal experience is quite different.
A Generational Decline in Empathy
The question of why people lack empathy isn’t just about individuals. There’s evidence that empathy has been declining at a population level. A meta-analysis combining 72 studies of nearly 14,000 American college students between 1979 and 2009 found that students scored about 40% lower on standard empathy measures than their counterparts from 20 or 30 years earlier. The biggest drop occurred after the year 2000.
The researchers behind the study, based at the University of Michigan, pointed to several possible contributors: increased social isolation, more time spent on screens and less in face-to-face interaction, and a cultural shift toward individualism and self-promotion. While the study measured self-reported empathy (which has limitations), a 40% decline across three decades is large enough to reflect something real about how social environments shape empathic development.
Empathy Can Be Rebuilt
Perhaps the most encouraging finding in empathy research is that the brain remains plastic enough to strengthen empathic responses even in adulthood. Compassion-based interventions, structured training programs that use meditation and perspective-taking exercises, have been shown to produce measurable changes in brain function. A review of longitudinal neuroimaging studies found that these interventions increased activity in prefrontal regions (involved in perspective-taking and emotional regulation) and in the brain’s reward system.
The reward-system changes are particularly interesting. They suggest that compassion training doesn’t just teach people to think about others more. It makes the experience of connecting with others feel more rewarding at a neurological level. The training also appeared to change how the brain processes visual distress cues, with participants showing greater engagement when viewing someone in pain rather than looking away. These programs typically run for several weeks and involve daily practice, but the fact that they produce detectable brain changes suggests that empathy is not a fixed trait. It’s a skill, and like most skills, it responds to practice.