Field notes · Mind & brain · Suicide prevention

What lies underneath. How science understands suicidal pain — and why connection is the counterweight.

A 10-minute read · Reid Robison, MD · Suicide Prevention Month 2026

For most of history we explained suicide with a single word — madness, sin, weakness. None of them helped anyone. Over the last thirty years the science has converged on something far more useful: a picture of what builds suicidal thinking, what turns thinking into action, and where each of us can step in.

If this is about you, right now

Call or text 988 (US, 24/7). Text HOME to 741741. Outside the US: findahelpline.com. You don't have to be sure it's "bad enough" to reach out.

TL;DR

Start with the pain.

The suicidologist Edwin Shneidman spent his career listening to people who had survived attempts and reading notes left by people who hadn't. His conclusion was disarmingly simple: suicide is driven by psychache — psychological pain that has become unbearable — and the act is an attempt to stop the pain, not a wish to be dead for its own sake1. Three decades later, a meta-analysis found that psychological pain is consistently higher in people with suicidal thoughts and past attempts than in those without10.

Pain alone isn't enough, though. Most people in terrible pain are not suicidal. The second ingredient, first documented by Aaron Beck, is hopelessness: in a ten-year study of patients hospitalized with suicidal thoughts, a high score on Beck's hopelessness scale identified 91% of those who later died by suicide11. Pain says this is unbearable. Hopelessness says and it will always be this way. Put together, they make ending one's life look — falsely — like the only exit.

Pain says "this is unbearable." Hopelessness says "and it will always be this way." Most of prevention is proving the second sentence wrong.

Thoughts and actions are different questions.

The single most important shift in the field over the last decade is called the ideation-to-action framework3. For years, researchers lumped everyone with "suicidality" together and looked for risk factors. The problem: nearly everything we measured — depression, hopelessness, even most psychiatric diagnoses — predicts having suicidal thoughts, but does a poor job predicting who moves from thoughts to an attempt.

From the WHO World Mental Health Surveys, 84,850 adults in 17 countries4. About a third of people who have ever seriously considered suicide go on to make a plan, and about three in ten make an attempt. About 60% of those transitions happen within the first year after suicidal thoughts begin — which is why early, simple interventions matter so much.

This matters for two reasons. First, it's hopeful: the large majority of people who think about suicide never act on it, and roughly nine in ten people who survive an attempt do not go on to die by suicide12. Second, it's humbling. A landmark meta-analysis of 50 years of risk-factor research — 365 studies — found that our ability to predict suicidal thoughts and behaviors was only slightly better than chance, and had not improved over five decades9. We cannot reliably pick out "the one" in advance. That's why modern prevention focuses on things that help everyone at risk, rather than on trying to be a perfect fortune-teller.

Four theories, one picture.

Three modern theories dominate the field. They use different words, but read side by side they describe the same shape. Tap through them:

"I don't belong" THWARTED BELONGING "I'm a burden" PERCEIVED BURDEN desire Capability LESS FEAR, MORE TOLERANCE !

Thomas Joiner's interpersonal theory13,5 says the desire for death arises when two painful beliefs meet — thwarted belongingness ("I don't belong; no one would miss me") and perceived burdensomeness ("the people I love would be better off without me") — especially when someone feels hopeless that either will change. Desire isn't enough, Joiner argues: acting also requires a capability — a lowered fear of death and higher tolerance for pain, which can be acquired through repeated painful or frightening experiences.

Its most important gift to clinicians and families is the language. "Burden" is the word I listen for. People in suicidal crises often believe, with total conviction, that their death would be a gift to their family. It is a perception, not a fact — and it can be challenged directly.

What the evidence says

A meta-analysis of 122 samples found the belongingness × burdensomeness interaction was significantly associated with suicidal ideation, and adding capability was associated with more prior attempts — but effect sizes were modest, and other combinations of the same variables predicted about as well6. Burdensomeness is the most robust single piece.

Step 1Pain + hopelessnessSuicidal ideation begins when psychological pain is combined with hopelessness that it will improve.
→
Step 2Pain outweighs connectionIdeation becomes strong when pain exceeds a person's connection — to people, purpose, roles, anything that makes life feel worth living.
→
Step 3CapabilityThoughts progress to attempts when capability is present: dispositional (temperament, pain sensitivity), acquired (habituation), and practical (knowledge and access).

David Klonsky and Alexis May's three-step theory2 is the leanest of the modern models, and I find it the most useful at the bedside. It puts connectedness at the center: not as a nice extra, but as the thing standing between pain and serious suicidal intent. Connection here is broad — a person, a pet, a job, a faith, a project, a future you still want to see.

Its third step also explains why practical capability — simply having ready access to a lethal means in the moment of crisis — matters so much, and why making the environment safer is one of the best-supported interventions we have14.

What the evidence says

Across multiple samples, pain and hopelessness together predict ideation better than either alone, connectedness is most protective when pain and hopelessness are high, and capability variables distinguish people who have attempted from those who have only considered suicide15.

Pre-motivationalBackground & triggersVulnerabilities (genes, early adversity, temperament), environment, and life events.
→
MotivationalDefeat → entrapmentFeeling defeated or humiliated, then trapped — no escape, no way forward. Belonging, burden, future thinking and social support make entrapment more or less likely to become ideation.
→
VolitionalFrom thought to actAccess to means, planning, exposure to suicide, impulsivity, fearlessness about death, imagery — the factors that govern whether ideation becomes behavior.

Rory O'Connor's integrated motivational–volitional (IMV) model16,17 is the most detailed of the three. Its central insight is entrapment: not just "I'm in pain," but "I'm in pain and I can't get out" — from a situation, a relationship, a diagnosis, one's own mind. It explicitly borrows Joiner's belongingness and burden as factors that move entrapment toward suicidal thoughts.

It also names things people rarely talk about — like exposure to someone else's suicide, or vivid mental imagery of one's own death — as factors that can move a person from thinking to acting. That's part of why safe messaging guidelines ask the media not to describe methods18.

What the evidence says

Defeat and entrapment consistently predict suicidal ideation in clinical and community samples, and volitional factors distinguish people who have made attempts from those with ideation alone17.

DiathesisA vulnerabilityGenetic loading, early-life adversity, and trait differences in mood regulation, impulsivity and decision-making.
×
StressA triggerAn acute psychiatric episode, a loss, a humiliation, intoxication, a crisis.
→
RiskCrisisNeither alone usually explains a crisis; the combination does.

The oldest of the frameworks here, John Mann's stress–diathesis model19,7, is the bridge to biology. It explains why two people can face the same devastating event and respond very differently — and why an episode of depression is dangerous for one person and not another. It also underlies Rudd's fluid vulnerability theory, which describes a person's chronic baseline risk and the acute spikes above it that come and go20.

What the evidence says

Broadly supported across clinical, family and post-mortem studies; it's the organizing model for most neurobiological research on suicide21,8.

The consensus, in one diagram.

If you asked the authors of these theories to agree on a single sketch — and most of them are in print agreeing on its main lines22,8 — it would look something like this:

01 · BackgroundVulnerability
  • Genes and family history
  • Early adversity, trauma
  • Temperament, impulsivity
  • Chronic illness and pain
02 · The fuelPain + hopelessness
  • Psychache, entrapment
  • Defeat, humiliation, loss
  • An untreated mood, psychotic, eating or substance disorder
03 · The amplifiersDisconnection + burden
  • "I don't belong"
  • "They'd be better off"
  • Isolation, rejection, discrimination
04 · Thought → actCapability + opportunity
  • Access to lethal means
  • Intoxication, impulsivity
  • Exposure to suicide
  • A crisis window of minutes
Counterweights at every layerAsking directlyConnectionA safety planSafer environmentTreatment that worksFollow-up after a crisisHope that's specific
A synthesis of the interpersonal, three-step, IMV and stress–diathesis models5,2,17,19. Layers 1–3 mostly explain who develops suicidal thoughts; layer 4 mostly explains who acts on them3.

In plain language, the consensus is:

  1. Suicidal thoughts come from unbearable pain combined with hopelessness or entrapment — not from weakness or a wish for attention.
  2. Disconnection and perceived burdensomeness intensify it; connection buffers it. This is the most consistent psychosocial finding across theories.
  3. Moving from thought to action is a separate step, governed by capability, access and timing — which is why making the environment safer works even when it doesn't change how someone feels.
  4. Vulnerability is biological and biographical, but it is not destiny.
  5. No one factor predicts well, so we shouldn't wait for certainty before we act9.

What's happening in the body.

The "diathesis" part of stress–diathesis has a physical address. None of these findings is a diagnostic test — they are group-level differences found in research — but together they explain why suicidal crises can feel less like a choice and more like a state the brain gets locked into23,7.

5-HT

Serotonin & the brakes

In 1976, Marie Åsberg found low levels of a serotonin breakdown product (5-HIAA) in the spinal fluid of depressed patients who had attempted suicide24. Post-mortem studies later found altered serotonin signaling in the ventral prefrontal cortex — a region involved in restraint and weighing consequences23.

HPA

The stress system

Among 78 depressed inpatients followed for 15 years, those whose cortisol failed to suppress on the dexamethasone test had an estimated 26.8% risk of eventual suicide vs 2.9% — roughly a 14-fold difference25. A stress response stuck in the "on" position is a recurring theme.

DNA

Early adversity leaves marks

In people who died by suicide and had a history of childhood abuse, the gene for the brain's cortisol receptor (NR3C1) was more heavily methylated — effectively turned down — than in those without such a history26. Experience can change how genes are read.

IL-6

Inflammation

A meta-analysis found higher levels of inflammatory messengers (IL-1β, IL-6) in the blood and post-mortem brain tissue of people with suicidal thoughts and behaviors than in psychiatric patients without them27.

BDNF

Growth & repair

Levels of BDNF — a protein that helps neurons grow and adapt — and its receptor were reduced in the prefrontal cortex and hippocampus of people who died by suicide28. Several treatments that rapidly reduce suicidal thinking appear to act on these plasticity pathways.

GWAS

Genes, modestly

Twin studies put the heritability of suicidal behavior at roughly 30–55%29. The largest genetic study (43,871 people who had attempted suicide, 915,025 controls) found 12 risk loci, with shared genetics linked to ADHD, smoking, risk-taking and chronic pain — independent of depression30.

Two other threads are worth knowing. People who have made attempts show, on average, differences in decision-making under uncertainty — favoring immediate relief over longer-term outcomes31. And the biology helps explain why intoxication and sleep loss so often appear in crises: both weaken the prefrontal brakes at exactly the wrong moment.

A caution I give every family: biology explains vulnerability, not blame — and it isn't a reason for fatalism. Every system above is one we know how to influence.

Why this matters: each layer has a counter.

The best part of a good theory is that it tells you where to push. Mapped onto the consensus, the evidence-based tools line up almost one-to-one:

Pain & hopelessness→Therapies aimed directly at suicidal thinking: cognitive therapy for suicide prevention cut repeat attempts by about half32; DBT roughly halved attempts in borderline personality disorder33. Ketamine can reduce suicidal thoughts within a day34 — see our ketamine post and white paper.
Disconnection & burden→Asking directly (it does not plant the idea35), staying in touch after a crisis — even brief caring letters reduced deaths in a randomized trial36 — and naming "burden" out loud so it can be challenged.
Capability & opportunity→A written safety plan37 and putting time and distance between a person and lethal means during a crisis14,38. Crises are often measured in minutes39.
Biological vulnerability→Treating the underlying illness, including the few medications with specific anti-suicide evidence: lithium in mood disorders40 and clozapine in schizophrenia41.

If you're reading this for yourself.

If some of this sounded familiar — the burden, the trap, the certainty that nothing will change — I want you to know that those feelings are symptoms, not verdicts. They are among the most treatable things I see in my work, and they lie. The next post in this series walks through how to make a safety plan, step by step, in about fifteen minutes. And you can call or text 988 today, not just when things are at their worst.

Sources

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Written following the Recommendations for Reporting on Suicide and the Action Alliance Framework for Successful Messaging42. Educational only — not medical advice.