It has been well established that gay and bisexual men experience disproportionately higher rates of suicide related ideation and behavior. According to a meta-analysis conducted by King and his colleagues, gay and bisexual men are approximately four times more likely to attempt suicide over their lifetime in comparison to heterosexual men [1]. While evidence of this disparity has been accumulating, there has been less attention to the processes that have generated it [2].

Global theories of suicide, such as the interpersonal psychological theory [3] and clinical model [4], have been described as inadequate on their own for explaining the burden of suicide related ideation and behavior among gay and bisexual men [5]. Therefore, theories that explicitly take into account the unique experiences of sexual minorities are critical to better understanding the processes that sustain this inequity. Thus far, minority stress model [6], psychological mediation model [7] and ecological systems models [8] have emerged in the suicide literature as three theories that potentially address the unique vulnerabilities of sexual minorities to suicide related ideation and behavior, though few of these have been tested with empirical data [5, 9].

Another conceptual framework that may help explain the excess rate of suicide related ideation and behavior among gay and bisexual men may be found in syndemic theory. The term syndemics was coined by medical anthropologist Merrill Singer in the mid-90s to describe how health problems tend to co-occur, overlap and fuel each other to create a mutually reinforcing cluster of epidemics [10, 11]. More so, according to syndemic theory, these intersecting epidemics are understood to be the consequences of social inequity and the unjust exercise of power [11]. Syndemic theory distinguishes itself from other theories that link marginalization to negative health outcomes by its holistic lens - rather than seeing health outcomes, such as suicide and suicide related ideation and behavior, in isolation from other health problems, syndemic theory illuminates the synergistic interactions of multiple health problems and how these co-occurring epidemics affect communities and therefore degrade the overall health status of a population.

Syndemic theory has gained momentum in the gay and bisexual men’s health literature in recent years. It was first applied to gay and bisexual men by Stall and colleagues in a random sample survey of nearly 3000 gay and bisexual men in four major US cities. That study found that polydrug use, depression, childhood sexual abuse, and intimate partner violence were highly correlated among gay and bisexual men [12]. Furthermore, the study showed that accumulations of these health problems were significantly associated with sexual risk and HIV infection.

Since then several other public health studies have supported the existence of syndemics among gay and bisexual men. Stall, Friedman and Catania have also proposed a theoretical framework of syndemic production for gay men-informed by minority stress theory that posits that syndemics are socially produce by early adolescence anti-gay violence and stresses associated with migration to large cities to so called “gay ghettos” [13]. Most syndemic studies, including the theoretical framework of Stall and colleagues, have focused on HIV transmission risks, not suicide [14–24]. One notable exception is the work of Mustanski and colleagues who examined suicide among young gay and bisexual men. That study found that the experience of victimization increased syndemic burden. Syndemic conditions appeared to increase the odds of suicide attempts [9]. Those findings suggest that syndemic theory may be a potentially useful framework for the study of suicide among sexual minorities.

In this paper, the theory of syndemic will be applied to investigate suicide related ideation and behavior in a sample of Canadian gay and bisexual adult men. Drawing on the theoretical and empirical work above, the excess suicide related ideation and behavior was hypothesized to be socially produced through exposure to multiple forms of violence and highly correlated with other mental health and psychosocial problems common in gay and bisexual men’s lives. The ultimate goal is to understand the factors contributing to higher rates of suicide related ideation and behavior in gay and bisexual men, in order to generate strategies for suicide prevention specific to these groups.

Sex Now is a serial cross-sectional survey of gay and bisexual men administered every 12–24 months since 2002 in the Canadian province of British Columbia. The survey has been offered anonymously online since 2007. The sampling frame was expanded to include all of Canada in 2010. This paper uses data from the 2011 edition of the survey collected from September 2011 to February 2012. The survey was offered in Canada’s two official languages, French and English. Sex Now 2011 was the first large-scale Canadian survey of gay men’s social determinants of health. The questionnaire was developed in collaboration with a group of young investigators, who participated in all phases of the study, including questionnaire development, pilot testing, recruitment, survey administration, data analysis, and communication of results (including the present report). The domains of Sex Now 2011 included: sexual behaviors, health measures, relationships, health care services, working conditions, community participation, social support, and experiences of homophobia.

Participants of Sex Now 2011 were recruited from dating/sex-seeking websites (52.7 %), social media (23.1 %), an email database of previous survey participants (9.9 %), word of mouth (8.7 %), and other promotion activities (5.2 %). The survey protocol was reviewed by the independent Research Ethics Board of the Community-Based Research Centre for Gay Men’s Health.

Analytic plan

The analysis was guided by the syndemic production theory of Stall, Friedman and Cantania [13]. Consistent with this theory and previous syndemic studies [11, 17, 18], the accumulation of social stressors was hypothesized to lead to the development of psychosocial health problems, including suicide ideation and attempts. These health problems were predicted to be interrelated and mutually reinforcing (independently associated) -a “snowball” effect in syndemic theory (as described in Fig. 1). The analytic plan for this study was modeled on a syndemic-based analysis of HIV transmission risk in the 2010 version of the Sex Now survey [24].

First the relationships between lifetime indicators of anti-gay marginalization, suicide ideation and attempted suicide in the last 12 months were explored using logistic regression. Because the effect of marginalization was hypothesized to be additive, we calculated the percentage of respondents who experienced suicide ideation and who attempted suicide in the last 12 months by number of marginalization indicators. These relationships were tested using Chi-Square test for trend with p < 0.05 considered statistically significant.

Second, because suicide related ideation and attempt were hypothesized to be interrelated with and to have mutually reinforcing relationships with other psychosocial health problems, we examined correlations between all psychosocial health problems, including suicide ideation and suicide attempts in the last 12 months. Since those who experience multiple psychosocial health problems (those caught in syndemics) were hypothesized to be at increased risk for suicide ideation and attempts, the percentage of those who reported suicide ideation and attempted suicide in the last 12 months was calculated for each expanding number of psychosocial health problems.

Lastly, associations between individual psychosocial health problems and the count of those problems associated with suicide ideation or having attempted suicide were explored in logistic regression.

All multivariable models were adjusted for demographic variables including sexual orientation, as some researchers have found differences in suicide related ideation and behavior between gay and bisexual men [25]. Ninety-five percent confidence intervals (CIs) were calculated for all odds ratios; 95 % CIs which excluded 1 (p < 0.05) were considered statistically significant, though in interpreting results, emphasis is placed on the magnitude of effect. All analyses were performed using SPSS 20.0.

Our results add further evidence to the existing literature that shows that gay and bisexual are at increased risk of suicide related ideation and behavior as compared with heterosexual men. Lifetime experience of suicide related ideation and behavior was reported by 49.9 % of our sample; this is over 6 times what has been reported among Canadian heterosexual men (7.4 %) [26]. More so, findings of this investigation strongly suggest that experiences of anti-gay violence and marginalization increase suicide ideation and suicide attempts among Canadian gay and bisexual men. Moreover, health problems in our sample were associated with each other and with suicide behavior. This study therefore adds to the growing body of literature showing that health disparities occur in clusters among gay and bisexual men. These results, like those of Mustanski [9], support the notion that syndemic theory has the potential to advance research, theory, and interventions related to suicide in this population.

There are some limitations that need consideration when interpreting these results. First of all, since the study relies on an Internet convenience sample it is difficult to know how representative it is of the Canadian gay and bisexual men’s population. Moreover, because the survey was cross-sectional and reliant on self-reported retrospective data, conclusions cannot be drawn about the causality of outcomes, including the relation between marginalization and negative health outcomes. Because these outcomes (both psycho-social mediators and suicide-related outcomes) were measured as currently prevalent (within last 12-months), we may have underestimated the true burden of these issues resulting from early-life marginalization experiences (e.g., if some respondents experienced depression or suicide ideation/attempts after encountering antigay bullying/harassment during adolescence but then adapted and recovered from these mental health conditions). This misclassification of psychosocial and suicide-related outcomes would result in under-estimation of the associations we present. More so, we modeled our analysis according to Stall’s theory of syndemic production [13] but were unable to account for all the factors that may produce or mitigate negative health outcomes such as internalized stigma and protective factors such a social support. We also combined gay and bisexual men in our analysis; however, experiences of oppressions and syndemics may differ between these groups and should be investigated in future studies. Finally, the cross-sectional survey involved people who had attempted suicide and survived. They may have somewhat different characteristics than those whose suicide attempt was fatal.

This paper adds to the plea of other syndemic researchers, as well as that of community activists, to address gay and bisexual men’s health holistically and to create better living conditions for sexual minorities. Since many of the health disparities experienced by gay and bisexual men (such as HIV, depression, anxiety, polydrug use, suicide) happen synergistically, it is unlikely that any of these conditions would improve without attending to the others. This is concerning in the current context where HIV and STIs are generally the health issues of gay and bisexual men that receive the most public health attention, while other issues, particularly those related to mental wellbeing, are largely ignored. Suicide prevention is notably absent from gay and bisexual public health and community programming.

In exploring the particular psychosocial health problems that constitute this syndemic, we found that each was associated with suicide related ideation and behavior, but the largest effect was found in evaluating the cumulative number of problems—as predicted by syndemic theory. It is striking that men who experienced three or more psychosocial health problems had approximately seven times the odds of suicide ideation and sixteen times the odds of attempted suicide, compared to those with no problems. When all health problems were included in a single model (multi-indicator), the association with suicide ideation and attempts was removed for most but remained strongest for depression. This should not be surprising, considering that mood disorders are known to convey the highest risk for suicide related ideation and behavior in general populations [27].

This study helps identify some of the potential root causes of suicide related ideation and behavior among gay and bisexual men. The five marginalization indicators investigated were positively associated with suicide ideation and behavior in our sample, and the majority of gay and bisexual men (56.1 %) experienced at least one form of marginalization or anti-gay violence in their lifetime. A previous edition of the Sex Now survey (2010) showed that prevalence of physical violence, sexual assault and workplace discrimination was similar across all age cohorts, but the younger cohort experienced higher levels of sexist harassment than any previous generation [24]. Some of the marginalization indicators this study examined (i.e., physical violence, harassment) were also found associated with suicide related ideation and behavior in previous studies [9]. Workplace discrimination was, however, a novel contribution of this study.

Together these findings suggest that, despite the recent legal gains such as the availability of gay marriage, adoption and protection from discrimination under the constitution, a substantial number of gay and bisexual men still face homophobia. This is consistent with other data sources such as Statistics Canada research which shows that while hate crimes appear to be on the decline in Canada in general, it is not the case for hate crimes committed against sexual minorities [28]. In addition, hate crimes committed against sexual minorities are more likely to be violent and to result in injuries. Another study of Canadian youth found that 20.4 % s of sexual minority men were verbally harassed weekly because of their sexuality, while 17 % reported being physical assaulted at school [29]. These trends are concerning as those who experienced physical violence had nearly 3 times the odds of attempted suicide in the survey.

Efforts to prevent physical assault against gay and bisexual men, as well as other forms of violence and discrimination, are therefore urgently needed to ameliorate the social and health condition of this population, including reducing the incidence of suicide attempts. However, policies and interventions can be made to increase the safety of sexual minorities. For example a school-based survey in the Canadian province of British Columbia demonstrated that gay and bisexual students attending schools with anti-homophobia policies and gay-straight alliances (GSAs) had lower odds of discrimination, as well as lower odds of suicide ideation and attempts [30].

This study’s findings suggest that syndemics, that include suicide related ideation and attempts, are occurring among Canadian gay and bisexual men. This study also showed that psychosocial health problems have an additive effect on suicide, increasing the odds of suicide ideation and suicide attempts. Those who reported 3 or more psychosocial health problems had 6.9 times the odds of suicide ideation and 16.29 times the odds of a suicide attempt compared to those with no problems and these effects are driven in particular by experiences of depression and anxiety. These results highlight the importance of addressing gay and bisexual men’s health problems in a holistic manner rather than addressing each in isolation. Since all marginalization indicators increased the odds of suicide ideation and attempts, interventions to reduce social exclusion and violence are urgently needed.

These results concur with those of Mustanksi and colleagues which demonstrated that syndemic is a useful theory to advance understanding of suicide among gay and bisexual men. While both studies illuminate some of the pathways and social factors that produce suicide related ideation and behavior in this population, such influences have generally been inadequately attended to in research and remain poorly understood. Therefore suicide researchers ought to pay more attention to the pathways of suicide ideation and behavior, as they may be critical to the development of effective prevention interventions. Since the majority of gay and bisexual men experienced violence in our survey but only a small minority reported syndemics, suicide ideation and suicide attempts, an array of protective factors may exist. Identifying those would also be key to prevention and health promotion efforts. Furthermore, as the population of gay and bisexual men is diverse along axes of class, geography, education attainment, and ethnicity, researchers should also look at how suicide is experienced and distributed among differently positioned gay and bisexual men.