Love and touch literally blunt pain

The Short Version

Looking at a photo of someone you're in love with measurably reduces how much physical pain you feel. At Stanford, pain medicine chief Sean Mackey showed this in a brain-scanning study: "Love works great," he says, and the more in love people were, the more relief they got [1]. The effect runs through the brain's reward circuits, the same pathways involved in addiction, which reach down toward the spinal cord to damp pain. That is a different route from ordinary distraction, which works through the prefrontal cortex [1]. Andrew Huberman, discussing the study in two of his own episodes, says "These are not small effects" and links it to dopamine and to a broader rule: pain is a perception the brain builds, so love, touch, expectation and meaning can all turn it down [2][3]. The takeaway for recovery is that the people around you, and the feelings they stir, are part of how much an injury hurts, not a separate "emotional" extra.

Table of contents

What They Said

Sean Mackey: pain is built in the brain, so love can reach it

Mackey is a physician-scientist, chief of the Division of Pain Medicine at Stanford and a professor of anesthesiology and neurology [1]. His whole approach rests on one claim: what happens in an injured shoulder or neck is not pain. Sensors called nociceptors detect heat, cold, pressure and chemical changes, and their signals are shaped in the spinal cord. They only become the experience of pain once they reach the brain, where emotion, memory, cognition and expectation mold them into something unique to each person [1]. As he puts it, "pain is a sensory and emotional experience. It's all wrapped up. And so we want to treat the whole person" [1].

That is why he refuses to sort pain into mental and physical kinds. "I don't try to distinguish between this notion of psychological pain, physical pain," he says, because once you do, "you end up putting value judgments on people" [1]. His clinical rule is simple: "If they're in pain, I'm addressing the pain" [1]. Huberman, interviewing him, sums it up: "psychological is physiological and vice versa" [1].

The love study follows from that view. Huberman introduces it as research on how being in love can change the experience of pain "and probably does so at real physiological levels," adding that it "points to the incredible power of love in how we experience life" [1].

How the study came about. Mackey says it began at the Society for Neuroscience's annual meeting, where he was sharing a room with Art Aron, a psychologist who studies passionate love [1]. Together with postdoc Jarred Younger, they scanned people in the early, intense phase of romantic relationships while applying pain [1].

The design. Each participant got three conditions while receiving heat pain: viewing a photo of their beloved, viewing a photo of an equally attractive acquaintance, and doing a distraction task [1]. The distraction task was deliberately demanding. Mackey gives examples: think of every sport that doesn't involve a ball, or "Think about every vegetable that's not green." "It's an attentional distraction task," he explains [1]. The acquaintance photo mattered as a control, because it separated the effect of love from the effect of simply looking at an attractive face.

The result. "Love works great. Love works great. It was a wonderful analgesic. It's significantly reduced people's pain. And it turned out the more in love you were, the more pain relief you got" [1]. Asked to confirm that this was when viewing the photo, Mackey agrees: "When viewing the photo of the person you love" [1].

Measuring love. To know how in love people were, the team used a passionate love scale, which, in Mackey's words, asks "what percentage of the day are you preoccupied thinking about your beloved?" [1]. Some Stanford students were "thinking about their beloved 80% of the day" [1]. Mackey jokes that he wanted to use the scale to screen residency applicants, "because I want them focusing on patients not their beloved," and adds that when someone is writing you a prescription, "you might want to know if they are in a new romantic relationship" [1].

Two routes to the same relief. For Mackey, the most interesting finding was that "attention and love worked on different circuits" [1]. Distraction and love reduced pain equally well, but distraction worked through prefrontal regions, the outer cortical areas [1]. "Love worked on more of what we classically think of as these reward based circuits, the nucleus accumbens, the amygdala," along with a descending brainstem region, the substantia nigra, which sends signals from the brain down to the spinal cord to inhibit pain [1]. Huberman's reaction: "So classic addiction pathway." Mackey: "Classic" [1]. His lesson is that different psychological approaches engage different brain circuits to reduce pain [1].

An unpublished postscript. Mackey adds a finding they never published. A year later, Younger went back and assessed the strength of the students' relationships, assuming they were still together. He found "a rather high correlation" between love-induced pain relief, together with activity in the caudate nucleus and the insula, and the strength of the relationship a year on [1]. As Mackey puts it, "we had a brain scan that was a predictor of future strength of a relationship" [1]. He is clear that this was a side note they didn't publish, so it is suggestive rather than established.

Mackey on touch, meaning and stress

The love study sits inside a broader picture in Mackey's conversation of how connection and touch shape pain.

Touch closes the gate. Patrick Wall and Ronald Melzack's gate control theory explains why we rub or shake an injured thumb. Touch signals travel on fast A-beta fibers and, in the spinal cord, damp the pain signals. Mackey calls this the cheapest free version of neuromodulation ever discovered [1]. TENS units exploit the same mechanism with a buzzing electrical stimulus that activates "those touch fibers, the A-beta fibers" [1].

A parent's kiss does two things at once. According to the summary, Mackey notes that a parent kissing a child's scrape adds both touch and positive emotional meaning, and both reduce pain [1]. It is the everyday version of the love study: soothing contact plus the presence of someone who cares.

Parents set the frame. With his own son, Mackey tended to make light of minor injuries and laugh, since children take cues from their parents. He also warns that ignoring a child's real pain sends the wrong message [1].

Bad relationships can hurt, literally. When people report back pain or headaches that vanish on vacation or after they leave a bad job or relationship, Mackey isn't surprised. The brain drives the sympathetic nervous system and cortisol, and chronic stress affects tissues and produces real pain [1]. His own neck, injured in a car accident at 16, flares with stress, which he treats as a signal to work out or walk in the forest [1]. Love is the positive side of the same coin: if a draining relationship can add pain, a loving one can subtract it.

Distraction, and its limits. Time with friends and family, reading or walking counts as attentional distraction, which engages prefrontal and cingulate networks and can reduce pain significantly. It fails at night, though, which is why sleep is such a problem in chronic pain [1]. Mackey also names catastrophizing as one of the biggest amplifiers of pain and anger as another, with data suggesting that simmering, contained anger is worse than anger expressed outward [1].

Huberman: love as top-down pain control

In a Huberman Lab Essentials episode on pain and healing, Huberman presents Mackey's study as one of the strongest examples of the brain overriding the body's signals. He introduces it by saying a Stanford colleague who runs a major pain clinic "has published quality peer-reviewed data on the role of love in modulating the pain response" [2].

He describes the setup: people received heat pain, and the researchers "explored the extent to which looking at an image of somebody in this case a romantic partner that the person loved would allow them to adjust their pain response. And it turns out it does" [2]. The outcome: "They could tolerate more pain. And they reported it as not as painful" [2]. So love changed two things: how much heat people could take, and how bad it felt.

Huberman is emphatic about the size: "That response, that feeling of love internally can blunt the pain experience to a significant degree. These are not small effects" [2]. A little later: "these are not minor effects. These are major effects" [2].

He also notes the timing: "how new a relationship is, directly correlates" with people's ability to use this internal representation of love to blunt pain [2]. He doesn't leave long-term couples out, though. For those who have been with a partner for many years and still love them deeply, he says, "you had to do the work because relationships are work, but you've got a installed mechanism for blunting pain" [2].

Huberman places love in a family of top-down effects. "It's all going to be through that top down modulation that we talked about," he says, comparing it to Ramachandran's mirror box, which relieves phantom limb pain through vision alone, and to the construction worker in the British Medical Journal whose boot was pierced by a 14-inch nail [2]. The man was in excruciating pain until clinicians cut away the boot and found the nail had passed between his toes without breaking the skin [2]. That case runs the other way: an image created pain with no tissue damage. Love is the reverse, with an image of a loved one taking pain away.

The principle, in Huberman's words: "pain is a perceptual thing as much as it's a physical thing. It's a belief system about what you're experiencing in your body, and that has important relevance for healing different types of injury and the pain associated with that injury" [2]. He adds that what he's describing is "plasticity of perception, which has direct bearing on emotional pain and has direct bearing on trauma" [2].

He sets love next to other belief effects. Patients who expect a morphine injection report pain diminishing before it arrives: "Their pain starts to diminish because they know they are going to get pain relief" [2]. "Placebo effects are very real," he says [2]. Adrenaline also blunts pain by shutting down pain pathways, which is why people can do extraordinary things while injured and only feel it later [2]. He ends the section by saying that "in the end it's the chemicals and neural circuits that are giving rise to these perceptions or these experiences rather of things that we call pain, love, etc." [2].

Huberman: dopamine, touch and the chemistry of feeling safe

In a separate episode on controlling pain and pleasure, Huberman revisits the love study and adds a chemical explanation. According to the summary, people in new, obsessive love, thinking about their partner up to 80% of their waking time, tolerated more pain, likely through dopamine [3]. He then links it to the body: dopamine acts on brainstem neurons that communicate with the spleen and the immune system, which helps explain why feeling good makes us more resilient [3]. That is the closest any source comes to connecting love's pain relief to the body's wider defenses.

The same episode fills in the touch side. The instinct to rub or press near an injury rests on the Melzack and Wall gate theory: larger A fibers that respond to pressure release GABA onto the thin C fibers carrying pain signals and quiet them [3]. That is why pressure above or below an injury, as in some sports taping, can bring real relief [3]. Huberman also describes David Ginty's work at Harvard on neurons that respond to the direction of touch, which is why cats and many people like being stroked with the lie of the hair [3].

He lays out the chemistry of the good side of the scale. Dopamine drives anticipation and pursuit, while serotonin handles immediate satisfaction and is closely tied to oxytocin, warmth and safety [3]. Immediate, sensory pleasure also involves endogenous opioids released from the periaqueductal gray, which rise during long runs, childbirth and sex and raise pain thresholds [3]. He frames pain and pleasure as two ends of one continuum built from the same electrical signals, with the brain assigning the label: "Pain is a subjective emotional experience" [3].

He is also clear that pain threshold isn't fixed. It can be trained safely, and he says "increasing your pain threshold through the use of things like ice baths is something that really can be done" through context, choice and distraction [3]. Love is one of several contexts that shift the threshold.

Where They Agree, and Where They Don't

On the core finding, they agree completely. All three sources describe the same Stanford study and the same result: viewing a loved partner's photo lets people tolerate more heat and rate it as less painful, and stronger or newer love brings more relief [1][2][3]. Neither Mackey nor Huberman presents it as a soft or marginal effect. Mackey calls love "a wonderful analgesic" [1], and Huberman calls the effects "major" [2].

They agree that the relief is physical, not imagined. Mackey's refusal to separate psychological from physical pain [1], Huberman's "pain is a perceptual thing as much as it's a physical thing" [2], and his description of pain as a subjective emotional experience assembled by the brain [3] all make the same point. Because pain happens in the brain, anything that changes the brain's state, love included, changes the pain.

They describe the mechanism at different levels. Mackey is the most specific about anatomy: reward circuits (nucleus accumbens, amygdala) and a descending brainstem pathway to the spinal cord, distinct from the prefrontal route of distraction [1]. Huberman in one episode calls it top-down modulation, grouped with the mirror box and placebo [2]. In the other he points to dopamine, and from there to brainstem links with the spleen and immune system [3]. These fit together. Dopamine is the reward system's signaling molecule, and "top-down" describes the direction of control. But the dopamine and immune links are Huberman's interpretation as summarized, not findings Mackey describes from his scans.

They put slightly different weight on new versus lasting love. Mackey's data tie relief to how passionately in love people are, measured by how much of the day they spend preoccupied with their beloved [1]. Huberman agrees that newness matters but says long, loving relationships still give you an "installed mechanism for blunting pain" [2]. The study itself, as Mackey describes it, looked at people early in intense relationships [1], so Huberman's point about long-term couples is his extension, not something that study tested.

Love isn't uniquely powerful, just differently wired. An easy point to miss: in Mackey's study, distraction relieved pain about as well as love did [1]. What set love apart was the circuit it used, not a bigger effect. That matters for anyone who hears love blunts pain and concludes that people without a partner are out of luck.

No one in these sources disputes the finding. The disagreement, where there is any, is about how far it reaches. None of the sources claims that love speeds tissue healing. The direct evidence is about perceived pain and tolerance in a lab. The link to broader physical resilience comes from Huberman's dopamine and immune explanation [3] and from Mackey's clinical observation that stress and bad relationships produce real pain [1].

Why It Works

Pain is assembled in the brain. Nociceptors send signals about heat, pressure and chemistry, but those signals only become pain once the brain combines them with emotion, memory, cognition and expectation [1]. Nociceptors carry information about stimuli, not pain itself, and the brain assigns the label [3]. Anything that changes the brain's state at that moment can change the label.

Love recruits the reward system. Looking at a beloved's photo activated the nucleus accumbens and amygdala, classic reward circuitry [1]. Huberman places this within dopamine's role in anticipation and pursuit [3].

The reward system can reach down to the spinal cord. Mackey describes a descending brainstem pathway running from the brain through that area to the spinal cord to inhibit pain [1]. This is what makes the effect physiological: the brain sends signals down that suppress incoming pain signals, much as the pain-inhibits-pain system does through brainstem circuits [1].

Distraction uses a separate route. Attention works through prefrontal and outer cortical regions [1]. Since the two use different circuits, they are different tools, and Mackey notes that the challenge in pain research is matching approaches to people [1].

Touch works lower down, in the spinal cord. Rubbing, pressing and stroking activate large touch fibers that quiet pain fibers at the spinal "gate," partly through GABA [1][3]. A loving touch combines this spinal mechanism with the positive emotional meaning that works higher up [1].

Safety chemistry favors comfort. Huberman describes serotonin as tied to oxytocin, warmth and safety, and endogenous opioids from the periaqueductal gray as raising pain thresholds [3]. He also links dopamine to brainstem neurons that talk to the spleen and immune system, as a reason feeling good makes us more resilient [3].

Stress works the other way. Chronic stress, driven by the brain through the sympathetic nervous system and cortisol, affects tissues and produces real pain, which is why pain can fade after leaving a bad job or relationship [1]. Catastrophizing and simmering anger amplify pain [1]. Relationships can push pain up or down.

Where It Applies, and Where It Doesn't

It applies to how pain feels and how much you can tolerate. The evidence covers perceived intensity and tolerance of heat pain in a controlled setting [1][2]. That is directly relevant to anyone getting through an injury, a procedure or a painful recovery.

It is strongest in intense love. The more in love people were, the more relief they got, and newer relationships showed stronger effects [1][2]. Huberman believes long, committed relationships carry their own built-in version [2], but the study focused on early, passionate love [1].

It is not unique to romance. Distraction matched love's relief in the same experiment [1]. A parent's comforting kiss works through touch and positive meaning [1]. Time with friends and family counts as distraction that engages prefrontal and cingulate networks [1]. The broader lesson is that engaged, positive states reduce pain, and love is one especially strong trigger.

It has limits at night. Mackey warns that distraction fails at night, one reason sleep is so hard for people in chronic pain [1]. Whether love's reward-circuit route holds up better at night isn't addressed in the sources.

It doesn't prove faster healing. No source shows that love speeds tissue repair. Huberman's recovery protocol for actual healing is sleep, walking, heat over ice and caution with anti-inflammatory drugs early on [2], and Mackey's chronic pain care draws on medications, procedures, psychology, physical therapy, complementary approaches and education, which tend to work best combined [1]. Love and touch belong in that toolkit as pain modulators, not as replacements. If you're dealing with an injury or persistent pain, work with a clinician rather than relying on emotional support alone.

It can backfire when relationships are a source of stress. Mackey's patients whose pain lifts after they leave a bad relationship are a reminder that connection helps only when it's positive [1]. Anger, especially the simmering kind, amplifies pain [1].

It doesn't mean pain is all in your head. Mackey warns that dismissing pain you can't see, as in fibromyalgia, is harmful, and that the old one-to-one model of injury and pain leads us to project our own experiences onto others [1]. The love finding shows the brain can turn pain down. It does not show that people in pain should just think happier thoughts.

What To Do With It

1. Bring a loved one's face into the room. In Mackey's study, simply viewing a photo of the beloved significantly reduced heat pain [1]. Before a painful procedure, a shot or a rough rehab session, keep a photo of your partner or someone you love where you can look at it.

2. Let the people you love be present during painful moments. Huberman describes the "feeling of love internally" as what blunts the pain [2]. Visits, a hand to hold or a video call during recovery can call up that feeling on purpose.

3. Use touch deliberately. Rub, press or hold near an injury rather than avoiding it, which draws on the spinal gate mechanism [1][3]. Pressure above or below an injury, as in some sports taping, can bring real relief [3]. A caring touch from someone else adds emotional meaning on top [1].

4. Comfort children with touch and a light frame, without dismissing real pain. Mackey kissed scrapes and made light of minor injuries with his son, knowing kids take cues from parents, while warning that ignoring real pain sends the wrong message [1].

5. Use distraction when love isn't available. A demanding mental task, like listing every vegetable that isn't green, reduced pain as much as the loved one's photo [1]. Reading, walking or time with friends works the same way [1]. Plan for nights, when distraction fails [1].

6. Invest in long relationships as a health asset. Huberman says couples who have done the work of a relationship over many years have "a installed mechanism for blunting pain" [2]. Keeping a relationship strong is also, in part, a pain-management strategy.

7. Take stressful relationships seriously as a pain source. If back pain or headaches fade on vacation or away from a particular person or job, that pattern means something, according to Mackey [1]. Address the stress, and watch for catastrophizing and simmering anger, which amplify pain [1].

8. Combine love with the rest of recovery. Pair connection with Huberman's healing basics (sleep, a daily walk that doesn't aggravate the injury, heat rather than ice) [2] and with the multi-pronged care Mackey describes [1]. Love can make pain more bearable, but it doesn't replace treatment.

Sources

1. Dr Sean Mackey Tools To Reduce Manage Pain · Huberman Lab
2. Control Pain & Heal Faster With Your Brain | Huberman Lab Essentials · Huberman Lab
3. How to Control Your Sense of Pain & Pleasure · Huberman Lab