Systematic Review: Discrimination and Health Outcomes

Systematic Review: Discrimination and Health Outcomes

Mimoun Azizi ¹, Ibrahim Krenawi *²

1. Chief Physician, Senior Consultant Neurologist and Neurogeriatrician, Klinikverbund Südwest, Sindelfingen, Germany.
2. Consultant Neurologist, Ain Alkhaleej Hospital, Al Ain, UAE.

*Correspondence to: Ibrahim Krenawi, Consultant Neurologist, Ain Alkhaleej Hospital, Al Ain, UAE.

Copyright

© 2026 Ibrahim Krenawi, This is an open access article distributed under the Creative Commons Attribution  License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: 13 July 2026

Published: 01 August 2026

DOI: https://doi.org/10.5281/zenodo.21713977

Abstract

Discrimination is a widespread biopsychosocial stressor that has important clinical and population-wide impacts. It is a systematic review that summarizes the evidence from epidemiologic research, meta-analyses, and mechanistic studies to describe the psychological, physiologic, and structural mechanisms through which discrimination affects health. The results have indicated strong correlations with depression, anxiety, sleep disturbance, autonomic dysregulation, HPA-axis changes, systemic inflammation, poor glycemic control, hypertension, metabolic dysfunction, and increased cardiovascular morbidity and mortality. The effects are experienced throughout the lifespan, though children, adolescents, and those who experienced overlapping stigmas are more vulnerable. The population-level risk is further increased by structural stigma, such as discriminatory policies, neighborhood deprivation, and institutional bias. There is evidence supporting interventions that include trauma-informed care, anti-bias training, behavioral risk modification, community-based support, and policy reforms. Recognizing discrimination as a pathogenic exposure is central to clinicians and health systems that aim to minimize disease burden and promote equitable, patient-centered care.

Keywords: Health effects of discrimination, Discrimination and chronic disease risk, Discrimination in Healthcare, Psychological impact of discrimination, Structural stigma and population health, Discrimination and cardiovascular outcomes, Biological pathways of stress and discrimination, Discrimination and mental health disorders.

Abbreviations

Introduction

The discrimination concept is gaining recognition within modern clinical medicine as a powerful and multidimensional impact on health, with the ability to affect the morbidity trends in psychiatric, cardiometabolic, immunologic, and behavioral measures. There is a growing body of evidence showing that discrimination, both racial and gender-based, weight-related, sexuality-related, disability-related, and socioeconomic, is a persistent psychosocial stressor that has physiological and clinical effects on the body [1]. In contemporary health systems, discrimination is viewed not as a simple social inconvenience but as a phenomenon that becomes biologically integrated, changing the neuroendocrine systems, inflammatory pathways, cellular aging, and health-seeking behaviors in the long run [2].

Discrimination clinically falls across the continuum of microaggression and verbal aggression between people to structural discrimination in laws, institutional practices, media space, and healthcare environments. The exposures can be episodic, cumulative, or lifelong, and it has been found that the burdens of discrimination disproportionately affect individuals who are marginalized racially/ethnically, who are in LGBTQ+ communities, those with obesity, individuals with disabilities, and those who are socioeconomically disadvantaged [3]. Notably, contemporary cohort and meta-analytic studies all show that these tendencies of discrimination do not have a limited range of effects and translate to clinically profound consequences, including major depressive disorder, anxiety syndromes, post-traumatic stress symptoms, hypertension, abnormal glucose regulation, and high risk of cardiometabolic diseases [4].

Pathophysiologically, discrimination causes chronic activation of the hypothalamic-pituitary-adrenal (HPA) axis and sympathetic nervous system, which leads to chronic cortisol dysregulation, immune upregulation, endothelial damage, and metabolic malfunction [2]. Prolonged expression of these systems has been linked to inflammatory biomarker changes, such as CRP and IL-6 inflammation, and biological premature aging, to demonstrate the change in telomere length in various populations [5]. These processes offer strong biomedical principles on why discrimination is becoming an acceptable clinical exposure, having quantifiable health effects.

Of relevance is the fact that discrimination has a direct impact on healthcare engagement and delivery. Patients who are discriminated against, particularly weight stigma, LGBTQ+ bias, or racial prejudice, note that they have reduced trust with clinicians, refuse to visit healthcare facilities, and delay necessary screenings and managing chronic illnesses [6]. To the physicians, this highlights an important fact: discrimination is not an abstract notion in society but a determinant that can be altered to affect adherence, follow-up, therapeutic alliance, and health outcomes.

Exposure to discrimination in children and adolescents has been associated with premature psychological distress, maladaptive behavior, poor academic achievement, and the premature development of cardiometabolic risk factors [7]. Such a premature susceptibility implies that discrimination has health effects on a life course basis, which in turn can result in a compounding effect that may lead to morbidity in adulthood.

Combined, the evidence makes discrimination among the most clinically relevant social determinants of health in contemporary practice. This systematic review will synthesize the best evidence-based studies on epidemiologic, physiological, and behavioral studies to offer clinicians a definitive, authoritative answer to what is the best evidence on the impact of discrimination on health, where is the best evidence, and how healthcare systems can act to diminish the impact of discrimination.

Methods

The systematic review was formulated in an evidence-based, clinically oriented, physician-oriented methodology. Based on evidence synthesis best practices, a thorough search strategy was used in order to get the most clinically relevant, high-quality literature on the relationship between discrimination and adverse health outcomes.

Search Strategy

A wide search was undertaken (PubMed/Medline, PMC, Scopus, Web of Science, Embase, PsycINFO, and Google Scholar), and all available records up to November 2025 were searched [8]. Controlled vocabulary and free-text terms were used in the search. The keywords were: discrimination, racism, stigma, structural stigma, health outcomes, mental health, cardiovascular, metabolic syndrome, biomarkers, weight stigma, and sex-orientation discrimination, in conjunction with systematic review, meta-analysis, cohort, prospective, and randomized. This strategy made it possible to capture cross-disciplinary literature in the fields of psychology, epidemiology, cardiology, endocrinology, and public health [3].

Inclusion and Exclusion criteria

Research articles were incorporated in case they met the following criteria:

• Large-scale prospective cohorts, rigorously undertaken cross-sectional studies, or systematic reviews or meta-analyses.
• Operationally defined exposure variable, discrimination, or stigma.
• Quantifiable mental, physical, physiological, or behavioral health results.
• Adult or children populations in any demographic or geographic environment [4].

Studies were excluded if they were:

• Purely qualitative and no measurable results (only provides a context)
• Commentaries, narrative essays, opinion pieces.
• Research in which no health-related outcomes were taken [7].

This screening strategy meant that only data whose results could be measured and interpreted clinically were included in the ultimate synthesis.

Screening and Data Extraction

Abstracts and titles were filtered in terms of relevance, and full-text analysis was done afterwards. Data extraction focused on:

• Form of discrimination exposure
• Population and setting of the study
• Mental health outcomes
• Cardiometabolic or physiologic outcomes
• Biomarker (cortisol, inflammatory markers, telomeres) data.
• Outcomes in terms of behavior and healthcare utilization.
• Exposures at the structural/policy level [9].

This hierarchical extraction provided the opportunity to combine epidemiologic results with biologic and clinical interpretations.

Synthesis Approach

Since the evidence base used was heterogeneous (including meta-analyses, prospective cohorts, and cross-sectional designs, etc.), a systematic qualitative synthesis was chosen as the priority method. The special emphasis was put on:

• Huge longitudinal data.
• Research showing physiologic mechanisms.
• Meta-analysis evidence of discrimination on health.
• Repeated biomarker results [2].

Where fitting, similar patterns in various types of studies were enhanced to enhance causation.

Epidemiology and Forms of Discrimination

Discrimination works at various layers of society and manifests in clinically significant ways, and is applied to different groups of populations across the globe. It can be characterized by its epidemiology since it is not only interpersonal, but also institutional, structural systems that systematically disadvantage certain groups of people. Modern data indicate that discrimination is not an exceptional or solitary case; instead, it is a common, repetitive exposure that has a direct relationship with the disease burden and population wellbeing [3].

Interpersonal Discrimination

Verbal harassment, exclusion, and blatant biased treatment are all examples of overt forms of interpersonal discrimination, and less apparent yet still microaggressive, which build up over time. The disproportionately high rates of these exposures are reported among racial and ethnic minorities, LGBTQ+ individuals, people with obesity, people with disabilities, and socioeconomically disadvantaged individuals [3]. The recent multidisciplinary research points out that even chronic, but low-intensity interpersonal discrimination may produce major psychological and physiological stress reactions [4].

Institutional and Healthcare-Related Discrimination

Institutional discrimination is prejudiced practices that are deeply embedded in the healthcare systems, workplaces, schools, and other formal institutions. In clinical medicine, this can manifest as diagnostic assumptions that are biased, less empathetic, less preventive of pain, or preventive care is not equally available. It has been shown that weight stigma in a medical setting, specifically, leads to delayed care, low adherence, and worsening chronic condition management [6]. Likewise, LGBTQ+ patients often report the experiences of discrimination that reduce trust in the healthcare system and prevent them from seeking healthcare [10].

Structural and Policy-Level Discrimination

Structural discrimination involves forces at the societal level, including residential segregation, unfair policies, discriminatory laws, and inequitable distribution of resources. This type of discrimination may hurt people even in cases where they are not subjected to interpersonal prejudice. It is demonstrated by evidence based on large population studies that restrictive policies that affect sexual and gender minorities deteriorate the population level mental health, cause psychological distress, and raise the rates of physiological stress [9]. Likewise, structural racism is a cause of cardiometabolic risk disparities, education, and life expectancy [7].

Internalized Stigma

The issue of internalized discrimination comes in when the persons internalize negative messages about who they are in society. This is highly described in weight stigma and LGBTQ + populations, in which internalized bias leads to depression, disordered eating, substance use, and maladaptive coping strategies [11]. The clinical evidence demonstrates that internalized stigma may increase the physiologic reactions to stress, as its multiplier of risks, not a passive consequence of discrimination in society [2].

Populations at Elevated Risk

In both epidemiologic literature and meta-analysis findings, some populations are found to be extremely susceptible to exposure to discrimination again and again:

• Minorities that are subject to enduring systemic racism [1].
• Obese people who are subjected to weight stigma both in medical and social settings [11].
• LGBTQ+ communities, affected by minority stress and policy-level stigma [9].
• Women and gender diverse individuals, especially in work and health care.
• Individuals with disabilities face discrimination concerning visibility.
• Minorities, who are socioeconomically disadvantaged and suffer due to structural conditions and lack of access to supportive resources [7].

To conclude, discrimination is an exposure of high prevalence and high effect whose epidemiologic patterns are evident and lead to health disparities in various groups of people. This all-pervasive character is what makes it necessary to make clinicians aware of discriminatory exposures as legitimate factors that contribute to disease processes.

Mental Health Consequences

Discrimination has become an entrenched psychiatric risk factor, whose effect size is equal to traditional psychosocial stressors like exposure to trauma and enduring adversity. The current epidemiologic and psychiatric studies are consistent that discrimination has been a factor in increasing vulnerability to depression and anxiety disorders, post-traumatic stress symptoms, and suicidality [4]. These groups are still present in the racial, gender, sexual-minority, and weight-stigmatized groups, which demonstrates a widespread and clinically-significant impact on mental health.

Depression and Anxiety Disorders

According to meta-analysis and large-scale cohort research, there is a significant and significant correlation between exposure to discrimination and major depressive disorder, generalized anxiety disorder, and persistent psychological distress [3]. Discrimination is a stressor that is chronic and unpredictable, and it triggers neurobiological processes in the pathophysiology of mood and anxiety, such as dysregulation of the HPA axis, sympathetic hyperactivity, and inflammatory cascades [2]. Repeated discriminative experiences also result in sustained cognitive and emotional hypervigilance, low self-efficacy, and emotional exhaustion in many patients, which creates cumulative emotional depletion that predisposes people to mood disorders.

Post-Traumatic Stress Symptoms

New evidence indicates that discrimination may result in trauma-like physiologic and psychological reactions, especially when the exposures are intense, frequent, or identity-based. Research in racially marginalized and LGBTQ+ communities has shown evidently high levels of clinically meaningful PTSD symptoms in relation to the extent and duration of discrimination [10]. Neurobiological evidence indicates that such experiences can be sensitizing stress-response systems to other types of chronic interpersonal trauma.

Suicidality and Self-Harm

An emerging body of evidence shows that discrimination is a unique predictor of high risk of suicidal ideation, suicide attempts, and self-harm. Epidemiologic data on the national level, especially in LGB+ groups, have recorded a high level of suicide risk associated with both the interpersonal and structural exposures to discrimination (ONS report; as cited in Hatzenbuehler [9]. Such dangers, in many cases, remain even when the socioeconomic status, initial mental health conditions, and social support are taken into consideration, highlighting the harmful psychological cost of discriminatory environments.

Table 1: Mental Health Outcomes Associated with Discrimination

Minority Stress and Cumulative Psychological Load

The minority stress model explains that individuals belonging to stigmatized groups face multiple layers of stressors that affect the group, such as anticipation of discrimination, internalized stigma, concealment stress, and direct discriminatory experiences, which interact to worsen the psychological vulnerability [4]. This model is supported by clinical observations and findings on the population level, which show that chronic vigilance and internalized devaluation increase the emotional and cognitive burden of discrimination.

Amplifying Effects of Intersectionality

People who are subjected to various types of marginalization (e.g., racial minority + sexual minority + socioeconomic disadvantage) have disproportionately increased depression, anxiety, and symptoms of trauma. This compounded stress and hinders coping capacity, coupled with the psychological effect of discrimination, is compounded due to this intersectional burden [7].

Implications for Clinical Practice

In the case of physicians, it is necessary to appreciate discrimination as a risk factor in psychiatry. Discriminative experiences should be included in regular discussions during mental health assessment procedures, particularly with patients belonging to underrepresented groups. The timely referral to psychotherapy and application of evidence-based interventions are possible through early identification, and downstream psychiatric morbidity can be minimized.

Cardiometabolic and Physiologic Impact

Discrimination has significant cardiometabolic and physiologic consequences, as a chronic toxicant that triggers neuroendocrine, autonomic, inflammatory, and metabolic mechanisms. The emerging evidence confirms that repeated exposure to discrimination is a predisposing factor to hypertension, coronary artery disease, atherosclerotic development, metabolic syndrome, and poor glycemic control [1]. These results have confirmed that discrimination is a clinical risk factor that contributes to a load of cardiometabolic diseases in various groups of the population.

Hypertension and Cardiovascular Disease

Several cohort studies, meta-analytic reviews demonstrate that there are similar relationships between discrimination and hypertension, stiffer arterial wall, high sympathetic activity, and cardiovascular occurrences [12]. In this case, especially about workplace discrimination, it has proven to be a powerful predictor of systolic and diastolic hypertension, and thus a sustained psychosocial strain in the workplace may be capable of accelerating cardiovascular risk trajectories [1].

Metabolic Dysregulation and Type 2 Diabetes

The stress associated with discrimination is a factor that leads to insulin resistance, glucose metabolism, and glycemic control. Experience of Black American populations shows that discriminatory experiences hurt diabetes management, leading to worse HbA1c outcomes and metabolic complications [13]. These results support the fact that social stress factors may have a direct impact on the state of endocrine regulation and chronic illness.

Dysregulation of the HPA Axis

Hypothalamic-pituitary-adrenal (HPA) axis is very sensitive to recurrent psychosocial misfortunes. Recurrent discriminatory experiences cause prolonged stimulation of the HPA axis that results in cortisol rhythm disruption, flat diurnal slopes, and maladaptive hormonal patterns [2]. Gradually, such dysregulation leads to visceral fat, immune dysfunction, and increased cardiometabolic risk, which directly connects the psychosocial experience to the physiologic disease pathways.

Inflammatory Activation

Repeated exposure to discrimination is linked to an increased inflammatory response in the form of the release of C-rea