Liking pain isn’t as unusual as it sounds. If you’ve ever craved spicy food, pushed through an exhausting workout, soaked in a scalding hot bath, or watched a horror movie for fun, you’ve voluntarily sought out something your body registers as painful or threatening. This behavior appears to be uniquely human, and it’s rooted in the way your brain processes pain and pleasure through overlapping chemical systems.
Pain and Pleasure Share the Same Brain Chemistry
The simplest explanation for why pain can feel good is that your brain doesn’t keep pain and pleasure in separate boxes. Several key brain regions, including the nucleus accumbens, the pallidum, and the amygdala, are involved in processing both. These areas contain what researchers call “hedonic hotspots,” clusters of neurons where stimulating the brain’s natural opioid receptors increases the enjoyment of rewards. Those same regions also release natural opioids during painful stimulation.
Two chemical systems drive most of this overlap. Your brain’s opioid system shapes how experiences actually feel: it can make sweet tastes more pleasant and simultaneously make pain less aversive. Dopamine, the other major player, doesn’t directly create pleasure. Instead, it generates motivation and wanting, the urge to seek something out again. When pain triggers a release of both, you get an experience that hurts but also feels compelling, even rewarding.
When your body encounters pain, the pituitary gland ramps up production of beta-endorphins, natural proteins that bind to the same receptors as opioid drugs. These endorphins inhibit the release of a chemical called GABA, which normally keeps dopamine in check. The result: a surge of dopamine associated with pleasure. The more intense the pain, the more endorphins your body produces. This is the core mechanism behind the paradox. Pain literally triggers a pleasure response.
The Relief High: Why Stopping Hurts So Good
Part of the pleasure isn’t the pain itself. It’s the moment the pain stops. Opponent process theory, a well-established framework in psychology, explains this. Every intense sensation generates a secondary response of the opposite kind, designed to bring your body back to a neutral baseline. So a strong painful stimulus produces a slow-building wave of relief and even euphoria that outlasts the pain itself. Studies measuring people’s subjective responses have confirmed this: the relief that follows pain is genuinely pleasurable, not just the absence of discomfort. This is one reason an ice-cold plunge or an intense massage leaves you feeling unexpectedly good afterward.
Benign Masochism: Enjoying Pain You Know Won’t Harm You
Psychologist Paul Rozin coined the term “benign masochism” to describe the widespread human tendency to seek out mildly painful or aversive experiences for fun. The key ingredient is safety. You know the rollercoaster won’t crash. You know the chili pepper won’t kill you. Your body sounds its alarms, but your mind overrides them with the knowledge that there’s no real threat. That gap between bodily panic and mental calm is where the pleasure lives.
Rozin’s research, which grew out of decades studying why humans love chili peppers, categorized benign masochism into several flavors: the burn of spicy food, the fear from horror movies and thrill rides, the ache of a deep-tissue massage, the exhaustion after a long run, the sting of strong alcohol, the sadness of a tearjerker film, and even the discomfort of extremely bitter foods. Humans are the only animals that consistently seek these experiences. You can condition a rat to tolerate chili, but you can’t get it to choose chili over plain food. People do.
How Spicy Food Hijacks the Reward System
Capsaicin, the compound that makes chili peppers hot, activates the same pain receptors on your tongue that respond to actual burning heat. Your brain interprets the signal as a genuine threat and mounts a defense: endorphins flood the system to blunt the pain. But capsaicin also has a more direct route to pleasure. It activates receptors in the brain’s reward pathway, exciting dopamine-producing neurons and increasing dopamine release in the nucleus accumbens, the same region activated by things like food, sex, and music. So spicy food delivers a double hit: the body’s pain-relief chemicals plus a direct stimulation of the reward circuit.
Exercise and the “Runner’s High”
The euphoria that follows intense physical effort has long been attributed to endorphins, but the picture is more nuanced. Research using opioid-blocking drugs found that blocking endorphins didn’t eliminate the pain-reducing effects of exercise. What did change was endocannabinoid levels, your body’s self-produced version of compounds similar to those found in cannabis. After intense exertion, circulating endocannabinoids increase significantly. These molecules bind to receptors distributed throughout the brain and spinal cord, particularly in areas that process pain. The “runner’s high” likely involves both systems working together: endorphins contributing to mood elevation and endocannabinoids dampening pain signals. The discomfort of pushing your physical limits is, quite literally, the trigger for this chemical cocktail.
Consensual Pain and Altered States
In the context of BDSM, the relationship between pain and pleasure becomes especially clear in physiological measurements. Studies have found that cortisol, a marker of physical stress, rises during consensual pain-play, particularly in submissive partners. But here’s what’s interesting: at the same time cortisol goes up, self-reported psychological stress goes down, and sexual arousal increases. The body registers stress while the mind experiences something closer to calm or even euphoria. That spike in cortisol isn’t distress in the traditional sense. It’s the body’s stress machinery fueling an altered psychological state, similar to what happens during intense meditation or ritual practices that involve physical ordeal.
Why Some People Like It More Than Others
Not everyone reaches for the hot sauce or the horror movie, and genetics play a measurable role in that variation. One of the best-studied genetic differences involves the OPRM1 gene, which provides instructions for building the brain’s primary opioid receptor. A common variation in this gene, called A118G, changes a single building block in the receptor protein. This small change affects how many opioid receptors end up on the surface of neurons and how well those receptors transmit signals.
People carrying the A118G variant show differences in pain perception, sensitivity to social rejection, preference for sweet and fatty foods, and how their body responds to stress. In practical terms, this means two people experiencing the exact same painful stimulus may get very different chemical rewards from it. If your opioid receptors are more responsive, pain may more readily produce that pleasurable endorphin rebound. If they’re less responsive, the same experience might just hurt.
Personality also matters. Research has found that people who score higher on benign masochism, meaning they enjoy a wider range of mildly painful experiences, also tend to score higher on sensation-seeking traits. There’s a correlation with darker personality traits too: people who enjoy the burn of spicy food, disgusting jokes, and the pounding heart of a scary movie tend to score higher on measures of boldness and lower on measures of caution. This doesn’t mean enjoying spicy food makes you antisocial. It suggests that the willingness to approach unpleasant sensations rather than avoid them is part of a broader personality pattern related to how you process arousal and threat.
The Brain’s Survival Logic
At the deepest level, the brain’s ability to override pain with pleasure exists for survival. The brainstem contains a pain-control circuit that communicates with the prefrontal cortex, the hypothalamus, and the amygdala. Its operating principle is simple: anything more important than pain should suppress the pain signal so the organism can keep functioning. A wounded animal fleeing a predator can’t afford to stop and nurse its injury. This descending pain-control system allows the brain to dial pain down when something else, whether that’s escaping danger, securing food, or mating, takes priority.
Humans have essentially repurposed this ancient survival wiring for recreation. When you bite into a painfully hot pepper, your brain detects a threat, floods the system with feel-good chemicals, and then you realize you’re fine. The result is all the chemical reward of surviving danger with none of the actual risk. It’s a neurological loophole, and it’s one that, as far as we know, only humans have figured out how to exploit on purpose.