A damning report from the British Medical Journal reveals how language bias and geographic exclusion are crippling worldwide efforts to build evidence-based medicine, leaving critical health insights buried and inaccessible to the world.
Research that could transform patient care across the globe is being overlooked simply because it is not written in English or published in prestigious international journals. This troubling reality has prompted medical experts to call for fundamental change in how global health research is conducted, indexed, and shared—a shift that could have significant implications for how the NHS accesses evidence to inform clinical decisions and health policy.
According to analysis published by the British Medical Journal, approximately 98 per cent of scientific output is published in English, creating a systematic barrier that excludes valuable research conducted in other languages. This dominance of English-language publishing means that rigorous, highly relevant studies conducted in non-English speaking regions are frequently overlooked, even when they contain insights crucial to understanding disease patterns, treatment outcomes, or public health interventions specific to particular populations or health systems.
The problem extends beyond simple language barriers. A substantial geographic bias exists within global health research, particularly affecting countries in Africa and other regions with lower incomes. A 2023 study examining African biomedical journals found that of 560 active publications, only 96—just 17 per cent—were included in at least one of the four major international databases: Web of Science, Scopus, Embase, or MEDLINE. By contrast, over 75 per cent of biomedical journals globally listed in open access directories were indexed in at least one major database. This disparity does not reflect lower quality research, but rather organisational, financial, and resource limitations that prevent African journals from meeting indexing requirements.
Assistant Professor Abdourahmane Ndong from Gaston Berger University in Senegal has highlighted how this exclusion fundamentally undermines evidence-based medicine. When systematic reviews and clinical guidelines are compiled using only English-language publications, they inevitably miss critical insights from regions where specific diseases are prevalent or health systems function differently. Language restrictions influence which studies are cited, included in clinical guidelines, and used to inform global health policies—particularly in areas where there are significant regional variations in health systems or disease burden.
The consequences are profound. Researchers conducting systematic reviews on health topics in sub-Saharan Africa have discovered that valuable data existed in different languages and non-indexed journals that offered critical insights for policy and clinical decision-making, yet this information remained invisible to the international medical community. Current guidance from PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses), an influential standard for conducting systematic reviews, does not require authors to include studies in multiple languages, effectively legitimising this exclusion.
Some researchers argue that applying language restrictions is a practical necessity when time and resources are limited. However, this approach reinforces a lack of inclusivity and perpetuates global power imbalances in research. It limits diverse perspectives, misses key global health insights, and ensures that the evidence base reflects primarily the health concerns and discoveries of wealthier, English-speaking nations.
To address this gap, some research teams have begun conducting systematic reviews with mandatory multilingual inclusion, searching for and translating keywords and eligible articles in multiple languages. These teams have also accessed African databases such as African Journals OnLine and African Index Medicus, uncovering research that would otherwise remain hidden from global scrutiny. These efforts, though labour-intensive, have revealed a treasure trove of evidence that improves understanding of health conditions and interventions in underrepresented regions.
The call for greater linguistic and geographic inclusion in global health research reflects a broader recognition that medical knowledge is not exclusively the province of high-income countries with established publishing infrastructure. Every language, as the author and philosopher Ngũgĩ wa Thiong’o noted, “carries its own memory of the world.” In health research, this means that research published in Arabic, French, Spanish, Portuguese, and other languages contains perspectives and evidence that enriches the global understanding of health and disease.
Expanding the scope of global health research requires investment in international collaboration, improvements to data governance and sharing, stronger indexing of journals from underrepresented regions, and a cultural shift within the research community towards valuing linguistic and geographic diversity. It also demands that major databases and research guidelines evolve to encourage rather than inadvertently discourage the inclusion of non-English literature.
Source: @bmj_latest
Key Takeaways
- Approximately 98 per cent of scientific output is published in English, creating systematic exclusion of valuable research from non-English speaking regions
- Only 17 per cent of African biomedical journals are indexed in major international databases, compared with over 75 per cent globally
- Language bias in research influences which studies inform clinical guidelines, policies, and patient care worldwide
- Greater linguistic and geographic inclusion would strengthen evidence-based medicine and reduce global health disparities
- Current systematic review standards do not require authors to include studies in multiple languages
What This Means for Kent Residents
For patients and healthcare professionals across Kent, this issue has direct relevance. The NHS increasingly relies on international evidence to inform clinical guidelines, treatment protocols, and health policy decisions. If that evidence base is skewed towards English-language publications from wealthy nations, it may not adequately reflect the health needs and disease patterns of diverse populations living in Kent and throughout the UK. Additionally, research from low and middle-income countries addressing health challenges—from infectious diseases to managing chronic conditions in under-resourced settings—could offer practical insights applicable to NHS services facing budgetary constraints. Kent and Medway NHS Trust, alongside local integrated care boards, should consider how they access and evaluate international evidence, ensuring that clinical decision-making draws from the broadest possible knowledge base rather than a narrow, linguistically filtered subset of global research.
