Why Do People Develop Behavioural Addictions? Key Risk Factors

Not everyone who gambles, surfs the internet, or engages in thrill-seeking behaviour develops an addiction. So what separates occasional engagement from a compulsive, hard-to-stop pattern? The answer lies in a set of identifiable risk factors – biological, psychological, and social – that interact in complex ways to push certain individuals toward behavioural addictions. Understanding these factors is not about assigning blame; it is about recognising the pathways that lead there.

What is a behavioural addiction? 🔗

Behavioural addictions involve a compulsion to repeat a rewarding activity – gambling, internet use, sex, shopping, gaming – despite the damage it causes to a person’s mental health, relationships, or finances. Certain nonsubstance behaviours bear a strong resemblance to alcohol and drug dependence, and growing evidence suggests they warrant consideration as “behavioural” addictions, a recognition reflected in the DSM-5’s new diagnostic category “Substance-Related and Addictive Disorders.” As with substance use disorders, no single factor causes a behavioural addiction. It is the interaction of multiple risk factors that matters most.

Substance dependence and cross-tolerance 🔗

One of the most established risk factors for behavioural addiction is an existing history of substance use disorder. The relationship is bidirectional and well-documented. A Canadian epidemiological survey found that the relative risk for an alcohol use disorder increased 3.8-fold when a gambling disorder was present, while among individuals with substance dependence, the risk of moderate-to-high severity gambling was 2.9 times higher. These are not coincidental overlaps – they reflect shared neurobiological architecture.

The shared brain circuitry 🔗

Both substance and behavioural addictions target the same reward system in the brain. At the core of both addictions lies a dysregulation of the brain’s reward circuitry – primarily involving the neurotransmitter dopamine – which becomes hypersensitive to rewarding stimuli, driving compulsive behaviours aimed at seeking gratification, while simultaneously weakening self-control mechanisms. This is why someone in recovery from alcohol dependence may find themselves drawn to gambling or compulsive internet use. The underlying craving architecture is the same.

The concept of cross-tolerance explains this further. The phenomenon of cross-addiction highlights the interconnected nature of substance use disorders and behavioural addictions – individuals struggling with one form of addiction are at heightened risk of developing another, suggesting shared underlying vulnerabilities and reinforcing mechanisms. Research on the genetics of gambling disorder supports this: the presence of the Taq A1 allele of the dopamine receptor D2 polymorphism has been linked to both gambling disorder and alcohol use disorder, and is associated with increases in impulsivity – suggesting that at least part of the shared genetic variance between gambling and alcohol dependence is due to a genetic predisposition toward impulsivity.

Furthermore, neuroimaging studies suggest shared neurocircuitry – particularly involving frontal and striatal regions – between behavioural and substance addictions, and twin studies suggest that genetic factors may contribute more than environmental factors to the overall variance of risk for developing disordered gambling, with heritability estimates of 50-60%, comparable to percentages for substance addiction.

Cognitive similarities between substance and behavioural addiction 🔗

Both pathological gamblers and individuals with substance use disorders typically discount rewards rapidly and perform disadvantageously on decision-making tasks, and both groups show diminished performance on tests of inhibition, cognitive flexibility, and planning tasks. These cognitive features are not just symptoms – they are also risk factors that pre-date the addiction and increase vulnerability to it.

Childhood trauma and impulsivity 🔗

Early life adversity is one of the most significant and consistent predictors of behavioural addiction. The effects are not simply emotional – they are neurological, altering how the developing brain regulates impulse control, stress, and reward-seeking across a lifetime.

How trauma shapes the developing brain 🔗

A child with a complex trauma history may struggle with self-regulation – specifically knowing how to calm down – and may lack impulse control or the ability to think through consequences before acting. Complexly traumatised children are also more likely to engage in high-risk behaviours such as self-harm, unsafe sexual practices, and excessive risk-taking. These are precisely the behavioural tendencies that increase vulnerability to addiction later in life.

Research into the specific mechanisms connecting trauma to addiction has shown that impulsivity is a key mediating factor. Childhood abuse significantly predicts addictive behaviours both directly and indirectly through impulsivity and irritability – with impulsivity specifically mediating smoking and internet addiction, while irritability mediates alcohol use and other addictive behaviours. This means trauma does not just raise the risk of addiction in a vague sense – it operates through identifiable psychological pathways.

Research confirms that childhood trauma is associated with four of five dimensions of impulsivity – positive urgency, negative urgency, lack of premeditation, and lack of perseverance – and that post-traumatic stress symptoms play a mediating role in this relationship. In plain terms, when trauma leads to PTSD symptoms, those symptoms amplify impulsive responses, and impulsivity is a direct driver of addictive behaviour.

Neglect, abuse, and “problem behaviour syndrome” 🔗

Researchers have identified what is often called problem behaviour syndrome – a clustering of risky or maladaptive behaviours in individuals with histories of abuse or neglect. Individuals who experience interpersonal trauma in childhood are at increased risk for numerous psychiatric disorders including substance abuse, oppositional or conduct disorders, eating disorders, and PTSD, and are also at risk for self-harm, poor impulse control, and attention difficulties.

The evidence from large-scale longitudinal research is compelling. The Adverse Childhood Experiences (ACE) Study – involving over 17,000 participants – found that nearly 64% had experienced at least one form of childhood trauma, and results demonstrated connections between childhood trauma exposure, high-risk behaviours such as smoking and unprotected sex, and chronic illness, with a cumulative economic and social burden described as extremely high.

Childhood trauma also disrupts affect regulation – the ability to manage emotional states. Deficits in affect integration and regulation manifest in symptoms associated with low impulse control, including addictive behaviours and self-harming behaviour, which at the time of their expression are experienced as ego syntonic. In other words, the behaviour feels right or necessary in the moment, even when it is destructive – a hallmark of compulsive addiction.

Social and demographic influences 🔗

Behavioural addictions do not occur in a social vacuum. Where a person lives, how much they earn, their gender, and their age all shape the risk profile in meaningful ways. Understanding these demographic patterns is essential for targeted prevention and intervention.

Poverty, unemployment, and financial stress 🔗

Economic disadvantage is a well-established risk factor. Low income, unemployment, and poverty are linked to gambling disorder, and the increase in the number of people with gambling problems has been shown to be linked to the increase in the availability of gambling opportunities. This creates a compounding effect: poverty raises the appeal of gambling as a potential financial solution, while simultaneously creating the psychological stress that feeds compulsive behaviour.

Risk factors for developing or maintaining a gambling disorder include being a single young male, married for less than five years, living alone, having a poor education, and struggling financially. These factors frequently co-occur in the same individuals, making some populations disproportionately vulnerable. Gambling, being an activity centred around money and often leading to financial hardship, may contribute to the relationship between debt enforcement and at-risk gambling – with financial difficulties partially contributing to the psychological distress experienced by gamblers.

Gender differences in behavioural addiction 🔗

Gender is one of the most consistently documented demographic risk factors. Young adults aged 18-35 years are known to be more susceptible to problem gambling, with a markedly higher risk among young men compared to their female counterparts, and a global meta-analysis found that males have a 3.44 times greater risk than females.

However, the picture for women is nuanced and increasingly concerning. Compared to males, females typically begin gambling at an older age and progress to problem gambling much faster, reflecting a telescoping phenomenon – and recent research from many jurisdictions indicates rapid rises in female problem gambling, especially among younger women. Trauma and social inequality, particularly in women, may also be risk factors for gambling disorder.

Older women are particularly vulnerable because they often face a higher poverty risk than older men – and among retired adults, fixed incomes and limited prospects of future earnings create conditions of heightened financial fragility that can increase gambling risk. This is why older women represent a distinct and often overlooked demographic in the behavioural addiction literature.

Age and developmental vulnerability 🔗

Age intersects with risk in two key ways: early exposure raises the lifetime probability of addiction, while different life stages create distinct vulnerabilities. Young adults aged 18-24 are more likely to engage in risky gambling behaviour because their brains are still developing – until the age of 24 or 25, the integration of emotion and logic is not fully realised, making good decision-making more difficult and young adults more apt to act impulsively.

Research confirms that among adolescents, key individual risk factors for problem gambling include impulsivity, sensation-seeking, depression, alcohol and drug use, antisocial behaviours, and male gender – with males reporting significantly higher gambling consequences on all scales. Early gambling exposure is particularly dangerous: children of pathological gamblers were found to be four times more likely to develop the disorder themselves.

At the other end of the age spectrum, due to the aging process, older adults face a greater risk of mental health challenges including impaired memory, cognitive decline, and dementia – conditions that reduce the capacity to resist compulsive behaviours and assess risk accurately. Combined with isolation, reduced income, and boredom in retirement, older age can create a distinct vulnerability pathway to behavioural addiction.

Why these factors rarely act alone 🔗

What makes behavioural addiction particularly difficult to prevent is that these risk factors rarely operate in isolation. Addictions are significant public health concerns with lasting impacts on individuals’ physical and mental health, as well as their social and financial well-being, and previous research suggests that engaging in at-risk behaviours increases the likelihood of developing more severe forms of addiction.

The Syndrome Model of Addiction offers a useful framework here: it approaches addictions as one syndrome in which various addictive behaviours – such as gambling and drinking – are viewed as manifestations of an underlying syndrome, with shared underlying factors linking them. A young man who grew up in poverty, experienced childhood neglect, and has a history of substance misuse does not carry one risk factor – he carries several that reinforce each other. Psychological distress, impulsivity, financial stress, and neurobiological vulnerability interact to make behavioural addictions far more likely.

This understanding has direct implications for treatment and prevention. Psychological distress is a particularly crucial factor predicting co-occurring at-risk gambling and drinking, indicating that co-occurrence is accompanied by significant psychological burden. Addressing only the visible addictive behaviour, without attending to its roots in trauma, poverty, or neurobiological vulnerability, is unlikely to produce lasting change.

What do you think? If behavioural addictions share so much neurobiological and psychological ground with substance addictions, should they be treated with the same clinical urgency and resources? And given that childhood trauma emerges as such a central risk factor, at what point should trauma-informed approaches become a standard part of addiction prevention rather than an afterthought?

References

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC4458066/
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC4803266/