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Online gaming and gaming disorder: more than just a trivial pursuit

Published online by Cambridge University Press:  01 August 2019

David Columb
Addiction Department, St John of God Hospital, Stillorgan, Dublin, Ireland
Mark D. Griffiths
Nottingham Trent University, Nottingham, UK
Colin O’Gara
Addiction Department, St John of God Hospital, Stillorgan, Dublin, Ireland UCD School of Medicine and Medical Specialties, University College Dublin, Dublin, Ireland
E-mail address:
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Gaming disorder is set to be included in the International Statistical Classification of Diseases and Related Health Problems alongside other behavioural addictions (gambling disorder) and substance-related addictions. Given the popularity of online gaming, this is set to become an increasingly common presentation to general mental health professionals, addiction specialists, and general practitioners. This article briefly examines online gaming and describes the characteristics of gaming disorder. Some features of online gaming that have addictive potential and similarities to other addictive behaviours such as gambling disorder are discussed. Finally, the article examines treatment options available for gaming disorder and treatment going forward from an Irish perspective.

© College of Psychiatrists of Ireland 2019 


The introduction of gambling disorder in the latest (fifth) edition of the American Psychiatric Association’s (2013) Diagnostic and Statistical Manual of Mental Disorders (DSM-5) represented a paradigm shift in how addiction is viewed. Gambling disorder was the first behavioural addiction to be officially recognised alongside alcohol and other substance-based addictions in terms of clinical and scientific importance. Behavioural addictions have been described as syndromes analogous to substance addiction but with a behavioural focus rather than the ingestion of a psychoactive substance (Grant et al. Reference Grant, Potenza, Weinstein and Gorelick2010).

In the latest (eleventh) beta draft edition of the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems (ICD-11), gaming disorder was included for the very first time under the heading of ‘Disorders due to substance use or addictive behaviours’ (World Health Organization, 2018). This is a timely inclusion because online gaming is a rapidly growing and popular industry, as evidenced by the reported revenue of over $100 billion (US) generated worldwide in 2017 (Batchelor, Reference Batchelor2018). With increased use and popularity of online gaming, there is an increased risk of developing problematic online gaming and gaming disorder for a small minority of individuals (Naskar et al. Reference Naskar, Victor, Nath and Sengupta2016). This should be of concern to the general psychiatrist who may face the increasing likelihood of individuals presenting with gaming problems in both adolescent and adult settings.

Development of online gaming

Online gaming (playing video games via the internet), although considered a relatively new phenomenon, has been in existence since the early 1970s. During this time, online gaming was primarily text based, such as the classic game Oregon Trail (1971), where players could type instructions to their characters in order to complete specific objectives. These games, while played over the internet, were single-player ventures and the players interacted between themselves and the game only. This changed with Maze War (1973) where, for the first time, online players could interact with each other within the game itself. The complexity and scope of online gaming grew over the years, with the development of Massively Multiplayer Online Role-Playing Games such as World of Warcraft in the early 2000s (GamesIndustry International, 2004). These games allowed millions of players across the globe to interact with one another through online gaming platforms. More recently, Multiplayer Online Battle Arena (MOBA) games (e.g. League of Legends) have seen a large increase in popularity, with video games like Fortnite hitting a peak of 3.4 million players concurrently online in August 2018 (Chalk, Reference Chalk2018). These online games can be accessed through a variety of means, such as through PC gaming (gaming via laptop or home personal computer), console gaming (dedicated gaming equipment such as PlayStation and Xbox consoles), and mobile gaming (via Android or Apple apps on smartphones or tablets).

There are many reasons why people engage in online gaming. These can be broken down into three overarching reasons for online gaming: for achievement, for social reasons, and for immersion in another world (Yee, Reference Yee2006). Achievement focuses on looking to progress in games, accumulate in-game wealth and status, and challenge/compete with others (Yee, Reference Yee2006). Social players look to work collaboratively with other players to achieve goals and to make friends, as well as to form and continue relationships with others (Yee, Reference Yee2006). Players looking to immerse themselves in the game world enjoy the role-playing aspect of gaming. They engage in gaming in order to relax and to temporarily escape from real-life (Yee, Reference Yee2006). Other authors have asserted more than three motivations for gaming such as Ballabio et al. (Reference Ballabio, Griffiths, Urbán, Quartiroli, Demetrovics and Király2017) who outlined seven motives (social, escape, competition, coping, skill development, fantasy, and recreation). Gamers can view gaming as a meaningful and purposeful activity and as a large part of their lives (Shi et al. Reference Shi, Renwick, Turner and Kirsh2019). However, a minority of people report negative experiences of online gaming and problematic gaming behaviours, such as a loss of control of time spent playing (Kuss & Griffiths, Reference Kuss and Griffiths2012). Therefore, it is important for clinicians to be aware of the features of problematic gaming and gaming disorder given its upcoming inclusion in ICD-11 (World Health Organization, 2018).

Gaming disorder

It is important to note that, for the majority of players, video gaming is a harmless, pleasurable pursuit. Gaming can confer a number of cognitive, motivational, emotional, therapeutic, health, and social benefits (Granic et al. Reference Granic, Lobel and Engels2014). Gaming has been shown to improve spatial awareness (Uttal et al., Reference Uttal, Meadow, Tipton, Hand, Alden, Warren and Newcombe2013), problem-solving skills (Prensky, Reference Prensky2012), mood (Russoniello & Parks, Reference Russoniello and Parks2009), and can help people acquire important prosocial skills in games requiring cooperation with other people (Ewoldsen et al., Reference Ewoldsen, Eno, Okdie, Velez, Guadagno and DeCoster2012). Gaming has also been shown to have educational benefits (M. D. Griffiths, Reference Griffiths2002) and to help children improve adherence to medical treatment (Kato et al. Reference Kato, Cole, Bradlyn and Pollock2008).

However, as the popularity of gaming (especially online gaming) has increased, the levels of gaming addiction and its associated co-morbidities have become more prominent. The average prevalence of gaming addiction across countries is estimated at 4.7% (Feng et al. Reference Feng, Ramo, Chan and Bourgeois2017). One of the main challenges facing clinicians is determining what differentiates healthy excessive interest in gaming from disordered gaming. In general, a healthy enthusiasm for video gaming has a positive effect on an individual’s life, whereas an addiction to gaming has a negative effect on their life (M. D. Griffiths, Reference Griffiths2010). In cases where gaming disorder may be suspected, it can be useful to apply the new criteria for gaming disorder as listed in the ICD-11. Here, gaming disorder is characterised by ‘a pattern of persistent or recurrent gaming behaviour (“digital gaming” or “video-gaming”), which may be online (i.e., over the internet) or offline’ (e.g. played on a gaming console) (World Health Organization, 2018). This is manifested by:

  • Impaired control over gaming (e.g. onset, frequency, intensity, duration, termination, context)

  • Increasing priority given to gaming to the extent that gaming takes precedence over other life interests and daily activities

  • Continuation or escalation of gaming despite the occurrence of negative consequences.

The behaviour pattern needs to be of sufficient severity to result in significant clinical impairment in personal, family, social, educational, occupational, and/or other important areas of functioning. The gaming behaviour and other features are normally evident over a period of at least 12 months (World Health Organization, 2018). These features mirror those of ‘Internet Gaming Disorder’ (IGD) in DSM-5, where it is included in the section ‘conditions for further study’ (American Psychiatric Association, 2013).

Gaming disorder can present with a number of co-morbid psychopathologies. A recent systematic review reported the most common associations with gaming disorder are anxiety (92%), depression (89%), Attention Deficit Hyperactivity Disorder (ADHD)/hyperactivity (89%), and social phobia/obsessive-compulsive symptoms (75%) (González-Bueso et al., Reference González-Bueso, Santamaría, Fernández, Merino, Montero and Ribas2018). However, the same review also noted that there is currently insufficient evidence to state whether or not gaming disorder is the cause or trigger of these psychopathologies (González-Bueso et al., Reference González-Bueso, Santamaría, Fernández, Merino, Montero and Ribas2018). It is therefore important to consider whether these symptoms are part of another disorder and/or if the excessive gameplay is being used as a coping strategy. Recent research from treatment-seeking adolescents with gaming disorders has shown various different aetiological pathways into problematic gaming (Torres-Rodriguez et al., Reference Torres-Rodríguez, Griffiths and Carbonell2018a, Reference Torres-Rodríguez, Griffiths, Carbonell and Oberst2018b, Reference Torres-Rodríguez, Griffiths, Carbonell, Farriols-Hernando and Torres-Jimenez2019). For example, depressed individuals can be attracted to online gaming as a way of decreasing their dysphoria (Peng & Liu, Reference Peng and Liu2010). Other addictive behaviours can also be associated with problematic gaming. For instance, substance misuse has been associated with problematic gaming in adolescent boys, with nicotine, alcohol, and cannabis usage twice as high compared to their non-problematic gaming peers (Van Rooij et al., Reference Van Rooij, Kuss, Griffiths, Shorter, Schoenmakers and Van De Mheen2014).

Gaming disorder is more prevalent in males than females, with the total prevalence of gaming disorder ranging from anywhere between 0.7% to 27.5%, the disparity being most likely due to the methodological differences in each study including different sample populations, the use of different screening instruments, and different operationalisations of what constitutes problematic gaming (Mihara & Higuchi, Reference Mihara and Higuchi2017). Time spent engaging in gaming is also a risk factor for developing gaming disorder (Mihara & Higuchi, Reference Mihara and Higuchi2017). Gaming-disordered patients spent almost double the amount of time gaming per week (31 hours) compared to their non-disordered counterparts (19 hours) prior to onset of the gaming addiction in one longitudinal study (D. A. Gentile et al., Reference Gentile, Choo, Liau, Sim, Li, Fung and Khoo2011). However, the same author (D. Gentile, Reference Gentile2009) and others (e.g. Griffiths, Reference Griffiths2010) have demonstrated that prolonged engagement in gaming does not necessarily mean the individual has a gaming disorder. Higher frequency of playing games and more years playing games have also been associated with the development of a gaming disorder (Mihara & Higuchi, Reference Mihara and Higuchi2017). Furthermore, impulsivity and low self-control have been identified as important risk factors in developing a gaming disorder (Mihara & Higuchi, Reference Mihara and Higuchi2017; Rho et al., Reference Rho, Lee, Lee, Cho, Jung, Kim and Choi2017).

Online gaming psychology

Part of the success of contemporary online gaming is due to some of the psychological mechanisms (the so-called ‘structural characteristics’) employed throughout these games, such as the utilisation of ‘near-misses’. The near-miss effect is ‘a special kind of failure to reach a goal, one that comes close to being successful’ (Reid, Reference Reid1986). These near-misses have been shown to enhance reward pathways in the brain and motivate gambling behaviours (Clark et al. Reference Clark, Lawrence, Astley-Jones and Gray2009) and are associated with addiction to slot machines (Mark Griffiths, Reference Griffiths1991) as well as video games (D. King et al. Reference King, Delfabbro and Griffiths2010; M. D. Griffiths & Nuyens, Reference Griffiths and Nuyens2017). A study on the popular mobile game Candy Crush showed near-misses to be the most frustrating outcome (as compared to wins and losses) and the outcome that triggered the largest urge to continue to play the game (Larche et al. Reference Larche, Musielak and Dixon2017). Online games can also use a variety of other reinforcement techniques, such as positive reinforcement, intermittent reinforcement, and punishment, in order to increase time spent playing the game (D. King et al., Reference King, Delfabbro and Griffiths2010).

Some specific strategies that can be employed in some online games are ‘pay to skip’ and ‘grinding’ (the performance of repetitive and tedious tasks typically as a solo endeavour or as part of team play). Players can be given the option of grinding to achieve a specific outcome (such as reaching another level), which could take hours of gameplay, or can pay to skip this process (Zagal et al. Reference Zagal, Björk and Lewis2013). These online game strategies play into the increased impulsivity seen in gaming disordered patients and are a likely contributor to the relationship between gaming disorder and ADHD found in young adults (Yen et al., Reference Yen, Liu, Wang, Chen, Yen and Ko2017).

Micro-transactions in online gaming and the blurring between gambling and gaming

Micro-transactions comprise the buying of virtual goods (such as ‘loot boxes’) or rewards that can be purchased for small payments within the game (Agarwal, Reference Agarwal2017) and are a large factor in ‘freemium’ (free-to-play) games. Freemium games offer no cost to download and play the game but generally contain some form of micro-transaction or in-game commercial strategy (Evans, Reference Evans2016). Profits from micro-transactions have been substantial, with one company reporting $4 billion (US) in revenue from micro-transactions in 2017 (Makuch, Reference Makuch2018), just over half of its total revenue for the year.

Loot boxes are defined as ‘in-game purchases consisting of a virtual container that awards players with items and modifications based on chance’ (Rouse, Reference Rouse2018). Players do not know the value of what is inside the box or chest until they open it, and these have been described as ‘virtual games of chance’ (M. D. Griffiths, Reference Griffiths2018). The reinforcement offered by these random boxes has been cited as a critical psychological ingredient of gaming addiction (M.D. Griffiths, Reference Griffiths2009). Loot boxes have courted significant controversy over the past year. The UK Gambling Commission’s position is that loot boxes are not a form of gambling because the items obtained from loot boxes do not have any real-life value outside the game (Gambling Commission, 2017). Others disagree, with the Belgian government declaring loot boxes to be a form of gambling and banning them from use in their country, citing loot boxes as encouraging children to gamble (MacDonald, Reference MacDonald2018). Ireland have decided against labelling loot boxes as a form of gambling, with the Department of Justice stating that it ‘does not have a role to regulate game developers on how their games work nor, in the offering of in-game purchases’ (Irish Legal, Reference Zendle and Cairns2018). A recent study found evidence for a link between the amount that video game players spent on loot boxes and the severity of problem gambling. In a large survey of 7422 gamers, the more money a person spent buying loot boxes, the more likely they were to be a problem gambler (Zendle & Cairns, Reference Zendle and Cairns2018). The article concluded that the gambling-like features of loot boxes could be responsible for problem-gambling severity, because the buying of other in-game items had no relationship with the level of problem gambling.

In-game currencies are virtual currencies that can be used inside the game to purchase items such as customisable outfits or to obtain specific in-game advantages. The use of alternative currencies in these games has been described as a way to hide the true value of the purchases (Duverge, Reference Duverge2016). There is some evidence to suggest that the willingness to pay more money is heightened depending on the medium by which the customer is paying. For example, in one study, consumers were shown to spend more money using debit cards rather than cash payments, given the increased transparency of cash payments (Runnemark et al. Reference Runnemark, Hedman and Xiao2015). The same finding has been found with players spending more money with chips compared to cash payments (Lapuz & Griffiths, Reference Lapuz and Griffiths2010). In addition, grinding to obtain in-game currency usually requires hours of gameplay to have currency in sufficient quantities to purchase certain items. This can encourage players to pay-to-skip in order to progress in the game and/or unlock content at a faster rate (Hamari et al., Reference Hamari, Alha, Järvelä, Kivikangas, Koivisto and Paavilainen2017).

In-game currencies can also be used within some games to gamble. Popular games such as Grand Theft Auto: San Andreas and Red Dead Redemption allow the player to gamble using the in-game currency by playing casino games or playing poker (D. L. King et al. Reference King, Gainsbury, Delfabbro, Hing and Abarbanel2015). Although these are optional side games in their respective games, they still involve betting, chance, and financial rewards (in the form of currency that can be spent within the game) (D. L. King et al., Reference King, Gainsbury, Delfabbro, Hing and Abarbanel2015).

Mobile gaming

For many people, their first introduction to video gaming is through mobile gaming. Games such as Snake which were pre-programmed into Nokia phones in 1997 were immensely popular. Mobile games are now the largest growing gaming market and represent the largest share of the global games market, with more than 50% of the market share (Wijman, Reference Wijman2018). The majority of people with mobile phones engage in mobile gaming, with 72.3% of mobile users in the USA engaging in mobile gaming (WePC, 2019). Interestingly, compared to other forms of gaming, mobile gaming is more popular with females compared to males (Mobile Marketing Association, 2015). Candy Crush Saga, one of the most popular mobile social games, reports that 69% of people playing are female (Chen & Leung, Reference Chen and Leung2016). Most people engaging in mobile games play for fun, to be sociable (interacting with friends), for relaxation, to win, or to pass time (e.g. while on public transport) (Chen & Leung, Reference Chen and Leung2016).

Risk factors for mobile game addiction are similar to traditional video game addiction. Social isolation and a lack of self-control have been found to be important factors increasing risk of mobile game addiction (Chen & Leung, Reference Chen and Leung2016). A major difference between mobile gaming and traditional gaming is the increased availability of these games given the ubiquity and availability of mobile phones (Engl & Nacke, Reference Engl and Nacke2013). Often mobile games are designed for more casual players to easily enter and access the games (Engl & Nacke, Reference Engl and Nacke2013) and utilised by people ‘on-the-go’, for example waiting for public transportation (Chen & Leung, Reference Chen and Leung2016). This increased accessibility has been seen as an important factor in other behavioural addictions such as gambling addiction (Columb & O’Gara, 2017). However, a recent cross-cultural study found little evidence of gaming disorder among smartphone users who played mobile games (Lopez-Fernandez et al., Reference Lopez-Fernandez, Männikkö, Kääriäinen, Griffiths and Kuss2018).


Esports are ‘competitive (pro and amateur) video gaming that is often coordinated by different leagues, ladders, and tournaments, and where players customarily belong to teams or other “sporting” organizations who are sponsored by various business organizations’ (Hamari & Sjöblom, Reference Hamari and Sjöblom2017). Viewers can watch professional players play against each other in a variety of games such as MOBA games (League of Legends) or sports games (FIFA 19). The popularity of esports is growing exponentially, with a worldwide audience size of 380 million in 2018 (Fuller, Reference Fuller2018). The popularity of esports is aided by live video-streaming platforms such as Twitch – a live video-streaming platform focused on video game live-streaming as well as live-streaming of other content such as sport, music, and other creative content (Stephenson, Reference Stephenson2018). Esports, via Twitch, stream to 100 million live viewers per month watching for an average of 106 minutes per day (MD Griffiths, Reference Griffiths2017). On 13 May, 2018, Ireland hosted the Three Ireland EStars League, an 8-week esports competition considered the first major esports tournament in Ireland (Cocking, Reference Cocking2018). There is a large gambling element associated with esports (Bányai, Griffiths, Király, & Demetrovics), and it is estimated that gambling on esports will reach $10 billion US dollars by 2020 (MD Griffiths, Reference Griffiths2017).

Treatment and management of gaming disorder

Even though gaming disorder is only just beginning to come to the fore as a recognised addiction (Saunders et al., Reference Saunders, Hao, Long, King, Mann, Fauth-Bühler and Chung2017), there are currently very few treatment options existing in Ireland. Some private specialist outpatient services and residential addiction centres offer treatment for gaming addiction in Ireland, but there are no dedicated services within the Irish mental health system. Irish child and adolescent psychiatrists are reporting increasing presentations to their clinics of parents seeking help for their child’s gaming addiction (Kelleher, Reference Kelleher2019). More specialist units will be required in the future as improved awareness and continued exposure to online gaming is likely to see an increase in presentations for gaming disorder.

In relation to specific treatment efficacy, there is a need for further research in this area. A systematic review of treatments for gaming disorder showed that there is a need for more evidence-based research (D. L. King et al., Reference King, Delfabbro, Wu, Doh, Kuss, Pallesen and Sakuma2017) although some recent studies have shown success among adolescents with IGD in Spain (Torres-Rodríguez et al. Reference Torres-Rodríguez, Griffiths and Carbonell2018). CBT has a larger base of positive evidence compared to other treatment modalities, including medication (D. L. King et al., Reference King, Delfabbro, Wu, Doh, Kuss, Pallesen and Sakuma2017). CBT has also been shown to improve symptoms of gaming disorder and co-morbid depression. However, these gains tend to be short term and further support post-treatment completion is likely required (Stevens et al. Reference Stevens, King, Dorstyn and Delfabbro2018).

There is no current consensus on the utility of medication in the treatment of gaming disorder. Bupropion has shown some promise (Han et al. Reference Han, Hwang and Renshaw2010) but requires further independent double-blind studies (D. L. King et al. Reference King, Delfabbro, Wu, Doh, Kuss, Pallesen and Sakuma2017). Escitalopram was found to be beneficial in the treatment of gaming disorder in a randomised control trial alongside bupropion (with bupropion showing greater efficacy in relation to attention and impulsivity than escitalopram in the same trial) (Song et al. Reference Song, Park, Han, Roh, Son, Choi and Lee2016). ADHD medications (atomoxetine, methylphenidate) have shown reductions in gaming disorder symptoms over a 12-week period in adolescents (Park et al. Reference Park, Lee, Sohn and Han2016). Further double-blind RCTs are required for these medications before definitive conclusions can be made on their efficacy in gaming disorder treatment (Zajac et al. Reference Zajac, Ginley, Chang and Petry2017).


Given the rise of online gaming and the recognition of gaming disorder as an addictive behaviour, there is a need for increased recognition of this disorder within the Irish healthcare system. Further research is required into efficacious treatment programmes for gaming disorder. Referral pathways need to be established to manage the current presentations of gaming disorder to our services with the goal of providing the most up-to-date and effective treatment options for these patients.

Financial support

No financial support was provided for this work.

Conflicts of interest

David Columb has no conflicts of interest to disclose. Mark D. Griffiths (MDG)’s university received funding from Norsk Tipping (the gambling operator owned by the Norwegian Government) for this research. MDG received funding for a number of research projects in the area of gambling education for young people, social responsibility in gambling, and gambling treatment from Gamble Aware (formerly, the Responsibility in Gambling Trust), a charitable body that funds its research program based on donations from the gambling industry. MDG also undertakes consultancy for various gaming companies in the area of social responsibility in gambling. Colin O’Gara has no conflicts of interest to disclose.

Ethical standards

The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committee on human experimentation with the Helsinki Declaration of 1975, as revised in 2008.


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