People with psychopathic traits do feel physical pain, but they consistently report feeling less of it than other people do. The twist is that their bodies may be reacting to pain just as intensely as anyone else’s. The gap between what psychopaths say they feel and what their nervous systems actually register is one of the more fascinating findings in this area of research.
They Report Less Pain, but Their Bodies Tell a Different Story
In a study published in PLOS One, researchers applied increasing pressure to participants and asked them to rate how much pain they felt. People who scored high on psychopathy measures rated the same physical pressure as significantly less painful than people who scored low. On a numerical pain scale, the high-psychopathy group averaged about 34 out of 100, while the low-psychopathy group averaged about 40 for the same stimulus. That’s a meaningful difference, roughly a medium-sized effect.
Here’s where it gets interesting. The researchers also measured skin conductance responses, tiny changes in sweat gland activity that reflect how your nervous system reacts to a painful stimulus. These responses are automatic. You can’t fake them or consciously dial them down. And on this measure, there was no difference between the two groups. Both groups showed the same physiological arousal when exposed to painful pressure.
The study also tested whether people with higher psychopathy traits needed objectively stronger pressure to reach the same pain level. They didn’t. When researchers measured the actual voltage of the pressure stimulator needed to produce what each person called “moderate pain,” the high-psychopathy group didn’t require significantly more intense stimulation. Their pain-processing hardware appears to work normally. It’s their interpretation of the signal, or at least their willingness to report it, that differs.
Why the Gap Between Feeling and Reporting?
There are a few possible explanations for why someone’s body registers pain normally while they report feeling less of it. One is that psychopathic traits involve a genuine difference in how the brain appraises threatening or unpleasant sensations. Pain isn’t just a nerve signal; it’s filtered through emotional circuitry that assigns meaning and urgency. If that emotional layer is dampened, the same nerve signal might land differently in conscious experience.
Another possibility is more straightforward: people with psychopathic traits may simply be less willing to admit discomfort. Psychopathy is closely linked to a self-image built on dominance, toughness, and emotional control. Reporting pain on a questionnaire, even anonymously, might conflict with that self-concept. The skin conductance data suggests the body is still sounding the alarm. Whether the person genuinely doesn’t hear it or just doesn’t acknowledge it remains an open question.
A third factor involves attention. Pain demands more of your awareness when you’re anxious or afraid of it. People with strong psychopathic traits, particularly the fearless, emotionally flat variety, tend to have reduced anticipatory anxiety. They don’t dread the next painful stimulus the way most people do, and that lack of dread may genuinely reduce how much pain registers in conscious awareness.
Primary vs. Secondary Psychopathy
Not all psychopathy looks the same, and the distinction matters for understanding pain. Researchers generally divide psychopathic traits into two patterns. Primary psychopathy involves the classic profile: low empathy, superficial charm, emotional coldness, and fearlessness. Secondary psychopathy involves impulsivity, poor behavioral control, and often significant anxiety and emotional instability.
These two types respond to stress in fundamentally different ways. Research using physiological monitoring found that people with strong primary psychopathic traits showed reduced activity in both branches of their stress response system. Their sympathetic nervous system (the “fight or flight” accelerator) and parasympathetic nervous system (the “rest and digest” brake) were both suppressed simultaneously. This co-inhibition essentially prevents a normal stress response from firing, which helps explain why primary psychopaths seem unbothered by danger and are notoriously poor at learning from punishment.
Secondary psychopathy tells a different story. People with these traits showed high parasympathetic activity, creating an imbalance that researchers link to emotional dysregulation. Rather than feeling too little, they may feel too much but lack the ability to manage it. This suggests that the “psychopaths don’t feel pain” idea applies most strongly to the primary, fearless subtype, not to psychopathy as a whole.
Interestingly, when researchers isolated primary psychopathy scores and looked at physical stress symptoms like headaches, muscle tension, and gastrointestinal complaints, there was no relationship. Primary traits didn’t predict fewer bodily stress symptoms. So even in the subtype most associated with emotional numbness, the body still appears to carry the effects of stress and discomfort.
Pain in Others: A Separate Problem
The question of whether psychopaths feel their own pain is distinct from whether they respond to other people’s pain. Most people experience a kind of echo when they see someone get hurt: your brain activates some of the same regions involved in processing your own pain. This is a core mechanism of empathy, and it’s consistently blunted in people with high psychopathy scores.
This means the pain-processing system itself works, but the bridge connecting “I see you’re in pain” to “I feel something unpleasant too” is weakened. For most people, watching someone suffer creates an automatic aversive response that motivates helping or at least not causing more harm. Without that bridge, hurting others carries less emotional cost, which is a significant part of why psychopathy is associated with cruelty and exploitation.
What This Means in Practical Terms
If you’re wondering whether a psychopath in your life genuinely doesn’t feel pain or is performing toughness, the honest answer is: probably some of both. Their nervous systems respond to painful stimuli in measurably normal ways, but their conscious experience of that pain, or at least their report of it, is genuinely reduced. The reduction is moderate, not dramatic. They aren’t walking through life impervious to physical sensation.
Where psychopathy creates a more stark difference is in the emotional dimensions of pain: the fear before it, the distress during it, and the motivation to avoid it in the future. These are the components that appear most dampened, particularly in the primary, fearless subtype. The nerve signal arrives. The alarm sounds in the body. But the emotional machinery that would normally amplify that signal into suffering, and then into learning, runs quieter than it does in most people.