17 Global Health Threats That Could Shape Our Future

When people talk about the biggest health threats of the future, the conversation often jumps to the next pandemic.

That makes sense. COVID-19 showed just how quickly a health crisis can spread across borders and disrupt everyday life.

But the next major threat to human health may not arrive as a single dramatic event.

It could come from many problems building up at the same time.

A new assessment from The Lancet Commission on 21st Century Global Threats to Health has identified 17 major threats that could have a significant impact on human health between 2025 and 2100.

The list goes well beyond infectious diseases. It includes obesity, high blood pressure, air pollution, climate change, poor mental health, smoking, inequality, conflict, antimicrobial resistance, and even the malicious use of artificial intelligence.

The bigger message is simple: global health is being shaped by far more than what happens inside hospitals.

The 17 Threats on the List

The Commission identified:

• Air pollution
• Antimicrobial resistance
• Childhood malnutrition
• Climate change
• Conventional conflict
• Declining development assistance for health
• High alcohol use
• High blood pressure
• Income inequality
• Low educational attainment
• Malicious use of artificial intelligence
• Nuclear conflict
• Obesity
• Naturally occurring pandemics
• Poor mental health
• Smoking
• Unhealthy aging

These threats may look unrelated at first.

A polluted city and a nuclear conflict seem worlds apart. So do childhood malnutrition and artificial intelligence.

But they have something in common: each can affect how long and how well people live.

The Commission's analysis covered 204 countries and territories and examined different possible futures to understand where the greatest health losses could occur.

Some of the Biggest Threats Are Already Sitting in Plain Sight

There is a striking detail in the report.

You don't have to imagine a futuristic disaster to find major health threats.

Consider obesity, high blood pressure, smoking, alcohol use, and air pollution.

These are already part of everyday life for millions of people.

The Commission's analysis estimated that obesity could account for about 23.1 billion disability-adjusted life years (DALYs) between 2025 and 2100. Low educational attainment and income inequality were also associated with substantial potential health losses.

That changes the way we might think about a “global health crisis.”

Sometimes, a crisis isn't something that suddenly appears on the news.

It can quietly grow for decades.

What Exactly Is a DALY?

The term may sound complicated, but the idea is fairly straightforward.

A disability-adjusted life year, or DALY, represents a year of healthy life lost because of illness, disability, or premature death.

So when researchers use billions of DALYs to describe a health threat, they're essentially asking:

How much healthy human life could be lost because of this problem?

It gives researchers a way to look beyond death rates alone and consider the impact of living with disease or disability too.

Climate Change Is Also a Health Story

Climate change is often discussed in terms of temperatures, storms, droughts, and rising sea levels.

But there is another side to the story: health.

Changes in the climate can affect food systems, infectious diseases, extreme weather exposure, and other conditions that influence human health.

The Commission's modeling suggested that limiting warming to around 1.8°C rather than 4.4°C could avoid roughly 1.89 billion years of healthy life lost.

That number is difficult to picture.

But the underlying message is easier to understand: decisions about the environment today can influence the health of people who haven't even been born yet.

Then There Are the Threats We Hope Never Happen

Some of the threats on the list are much more immediate and familiar.

Others sound like something from a science-fiction movie.

The Commission identifies malicious use of artificial intelligence and nuclear conflict as threats with potential for human extinction.

That does not mean extinction is expected.

Rather, these are considered relatively low-probability events with consequences so severe that they deserve attention and preparation.

AI, for example, can bring enormous benefits to medicine and society. But advanced technology could also be deliberately misused, including in ways that amplify biological or other threats.

The same principle applies to nuclear conflict: even if the likelihood of a catastrophic event is difficult to estimate, the consequences could extend far beyond the immediate destruction.

Low probability doesn't always mean low importance.

The Next Pandemic Is Still on the List

Naturally occurring pandemics remain one of the major threats identified by the Commission.

The COVID-19 pandemic demonstrated how quickly an infectious disease can affect healthcare systems, economies, education, travel, and daily life.

But preparing for another pandemic cannot happen in isolation.

Imagine a healthcare system already struggling with antimicrobial resistance, extreme weather, staff shortages, conflict, or limited resources.

A new outbreak would be much harder to manage.

That's why pandemic preparedness needs to be part of a much broader approach to health-system resilience.

The Threats Don't Stay in Their Own Lanes

This may be the most important idea in the entire assessment.

These problems can feed into one another.

Take conflict as an example.

Conflict can damage hospitals and healthcare infrastructure. It can displace families, disrupt food supplies, limit access to medicines, and make disease-control efforts more difficult.

Those pressures can then affect mental health and increase existing inequalities.

Climate-related disasters can create similar knock-on effects by disrupting food, housing, healthcare, and livelihoods.

One problem can make another harder to control.

That means solving global health challenges isn't simply about creating 17 separate action plans.

The connections between them matter just as much.

So, What Can the World Do?

The report isn't intended to be a list of reasons to panic.

It is, in many ways, a list of places where preparation could make a difference.

The Commission highlights three broad areas of action: making health systems more prepared for future threats, investing in new technologies and innovations that can help address health challenges, and improving systems for detecting and monitoring emerging risks.

That approach matters because waiting until a threat becomes a full-blown crisis is often the most expensive way to respond.

Preparedness has to happen before the emergency.

What Does This Have to Do With Everyday Health?

Not every item on the list is something an individual can solve.

No one can personally prevent a nuclear conflict or redesign the global climate system.

These challenges require governments, researchers, healthcare organizations, international institutions, and communities to work together.

But some of the issues on the list are directly connected to everyday health.

• Smoking.
• Alcohol use.
• Physical activity.
• Blood pressure.
• Mental health.
• Nutrition.
• Access to education and healthcare.

These may seem like individual concerns, but when millions of people experience the same risks, they become major public-health issues.

The Future Isn't Set in Stone

There is one reason not to look at these projections as a prediction of doom.

They describe possible futures, not an unavoidable future.

The choices made today can change what happens decades from now.

Better healthcare systems could reduce the impact of future outbreaks.

Cleaner air could protect respiratory and cardiovascular health.

Stronger education systems could improve health opportunities.

Climate action could reduce future health losses.

Responsible development of technology could help prevent emerging risks.

In other words, the value of this research isn't simply knowing what could go wrong.

It's knowing where action could change the outcome.

The Bottom Line

The next major global health crisis may not have a single face.

It could be a combination of chronic disease, pollution, climate change, conflict, inequality, mental-health challenges, infectious diseases, and emerging technological risks.

The 17 threats identified by the Lancet Commission may seem overwhelming when viewed together.

But they also provide a roadmap.

Some problems need global cooperation. Others require stronger healthcare systems. Some need better policies, research, education, or prevention.

And many need all of these at once.

The future of global health won't be decided by one breakthrough or one crisis.

It will be shaped by thousands of decisions made today.

And perhaps that is the most useful message from the report:

The future isn't something we simply wait for. We have a chance to prepare for it.