The Myth of a Single Cause: Why Suicidality Is Almost Always Multidimensional
The Myth of a Single Cause: Why Suicidality Is Almost Always Multidimensional
One of the most common questions asked after a suicide is:
- “Why?”
- Why did this happen?
- Why now?
- Why this person?
Family members ask it, friends ask it, and clinicians ask it. We ask it because we desperately want an explanation that makes an incomprehensible loss feel understandable.
Unfortunately, the answers we often hear are too simple.
- “It was because of depression.”
- “It was because of the divorce.”
- “It was because of trauma.”
- “It was because he lost his job.”
- “It was because she was lonely.”
While each of these may contain some truth, none of them is usually the whole truth.
Human suffering is rarely that simple.
Suicidality almost never emerges from a single cause. Rather, it is more often the result of multiple vulnerabilities converging at the same moment. Biological factors interact with psychological processes, emotional pain interacts with social isolation, and trauma influences beliefs about oneself and others. Life events shake identity and meaning, and protective factors weaken while distress intensifies. What finally appears as a suicidal crisis is often the culmination of many interacting processes rather than one isolated event.
This understanding is consistent with decades of suicide research. Contemporary models, including the stress-diathesis model, the Interpersonal Theory of Suicide developed by Thomas Joiner, and the Integrated Motivational–Volitional Model proposed by Rory O’Connor, all emphasize that suicidal behavior emerges through the interaction of multiple biological, psychological, interpersonal, and environmental influences rather than a single cause.
As clinicians, this has profound implications. If suffering is multidimensional, our assessment ought to also become multidimensional.
At the SWEET Institute, we have found it helpful to organize suicide formulation through what we call the SWEET Five Dimensions of Human Experience. These dimensions are not intended to replace established evidence-based suicide assessment tools. Rather, they complement them by helping clinicians understand the whole person behind the symptoms.
The first dimension is the body.
Too often, suicide assessments focus primarily on thoughts while giving insufficient attention to the nervous system that is generating those thoughts. Sleep deprivation, chronic pain, traumatic brain injury, substance intoxication, substance withdrawal, medication side effects, hormonal changes, and acute medical illness can dramatically influence emotional regulation, impulse control, and cognitive flexibility. Research has consistently demonstrated that insomnia alone is associated with significantly increased suicidal ideation and suicidal behavior. An exhausted brain tells a darker story than a rested one.
The second dimension is the mind.
Here we explore the person’s beliefs, interpretations, expectations, and cognitive habits. Decades of work by Aaron T. Beck demonstrated that hopelessness is among the strongest psychological predictors of suicide. Yet hopelessness does not arise in isolation. It develops through patterns of thinking: “Nothing will ever improve.” “I’m a burden.” “There is no future.” “There are no options.” As distress intensifies, the mind often becomes increasingly rigid, narrowing possibilities until suicide begins to appear as the only remaining solution.
The third dimension involves emotions and relationships.
Human beings are profoundly relational. We are shaped by love, belonging, attachment, rejection, and loss. Research by John Bowlby and later attachment researchers has demonstrated how early relational experiences influence emotional regulation throughout life. Joiner’s work further reminds us that feelings of thwarted belongingness and perceived burdensomeness substantially increase suicide risk. Many patients are not simply depressed; they are grieving, ashamed, lonely, humiliated, or convinced that they no longer matter to anyone.
The fourth dimension is meaning and identity.
Perhaps no psychiatrist articulated this more powerfully than Viktor Frankl, who observed that people can often endure extraordinary suffering when they retain a sense of purpose. Conversely, profound losses of identity, a retirement, divorce, chronic illness, loss of professional role, death of a spouse, or spiritual crisis, can produce an existential collapse that extends beyond traditional psychiatric diagnoses. Sometimes patients are not asking, “How do I feel better?” They are asking, “Who am I now?” and “Why should I continue living?”
The fifth dimension encompasses systems and environment.
No individual suffers in isolation from the world around them. Poverty, homelessness, unemployment, discrimination, violence, social isolation, lack of healthcare, immigration stress, legal difficulties, and limited access to resources all shape mental health. Recognizing these realities is not about removing personal responsibility; it is about acknowledging that human beings are deeply influenced by the environments in which they live. A comprehensive suicide assessment asks not only what is happening inside the person but also what is happening around the person.
One of the most useful metaphors for understanding suicidality is that of a perfect storm.
A storm rarely develops because of a single weather event. Instead, temperature, pressure, humidity, wind patterns, and geography converge until conditions become dangerous.
Suicidal crises often develop in much the same way.
Imagine an individual experiencing severe insomnia, increasing alcohol use, the recent end of a long-term relationship, mounting financial stress, childhood experiences of abandonment that are being reactivated, growing hopelessness, and a profound loss of purpose after losing a career. None of these factors alone necessarily leads to suicide. Together, however, they may overwhelm the person’s capacity to cope.
This way of thinking changes our interventions. Instead of searching for one explanation, we identify multiple leverage points.
- Can we improve sleep?
- Can we reduce emotional isolation?
- Can we strengthen social supports?
- Can we challenge hopeless thinking?
- Can we reconnect the person with purpose?
- Can we address substance use?
- Can we mobilize community resources?
- Can we help restore hope?
The more dimensions we understand, the more opportunities we have to intervene.
This is one of the most hopeful aspects of multidimensional formulation. If suffering develops through multiple pathways, healing can also begin through multiple pathways. Sometimes improving sleep creates enough emotional stability for psychotherapy to become effective. Sometimes restoring one important relationship rekindles hope. Sometimes helping someone rediscover meaning transforms how they experience pain. Sometimes reducing financial stress lowers despair enough for treatment to take hold.
Healing rarely occurs because of one perfect intervention. It often occurs because many small, compassionate, evidence-based interventions begin working together.
As clinicians, we do not have to solve every problem at once. We do need to understand the landscape of suffering well enough to know where healing can begin. For, suicide prevention is not merely about identifying risk. It is about identifying opportunities for hope.
Next in the Series
In our next article, we will go even deeper. Two people may experience the same loss and even report the same suicidal thoughts, yet require very different interventions. Why? Because suffering operates at different levels of psychological depth. We will introduce the SWEET Four Layers of Transformation and explore why matching interventions to the depth of suffering may be one of the most important—and overlooked—principles in suicide prevention.
Join Us
If these ideas are expanding the way you think about suicide assessment, we invite you to join us for our upcoming 4-hour virtual conference on September 18, 2026 from 9-1pm:
Together, we will integrate the best available evidence in suicide prevention with the SWEET Five Dimensions of Human Experience, the SWEET Four Layers of Transformation, collaborative formulation, validation, practical clinical tools, and immediately applicable strategies for helping people move from overwhelming suffering toward renewed hope.
Every person is more than a diagnosis, every crisis is more than a symptom; and every life is worth understanding.
References
- Beck, A. T., Brown, G. K., Berchick, R. J., Stewart, B. L., & Steer, R. A. (1990). Relationship between hopelessness and ultimate suicide: A replication with psychiatric outpatients. American Journal of Psychiatry, 147(2), 190–195.
- Joiner, T. (2005). Why people die by suicide. Harvard University Press.
- O’Connor, R. C., & Kirtley, O. J. (2018). The integrated motivational–volitional model of suicidal behaviour. Philosophical Transactions of the Royal Society B: Biological Sciences, 373(1754), Article 20170268.
- Pigeon, W. R., Pinquart, M., & Conner, K. (2012). Meta-analysis of sleep disturbance and suicidal thoughts and behaviors. Journal of Clinical Psychiatry, 73(9), e1160–e1167.
- Turecki, G., Brent, D. A., Gunnell, D., O’Connor, R. C., Oquendo, M. A., Pirkis, J., & Stanley, B. H. (2019). Suicide and suicide risk. Nature Reviews Disease Primers, 5(1), Article 74.
