Global Death Trends Reveal Surprising Shifts in What Kills Us

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For most of human history, the answer to “what kills us” was simple: infection, childbirth, or starvation. Children died in staggering numbers. Mothers died bringing them into the world. And if you survived childhood, a gut infection or a bad cut could still end you before you turned 40.

That world is gone. But what replaced it is stranger than most people realize.

The Global Burden of Disease Study 2017, led by Gregory A. Roth and hundreds of collaborators across 195 countries, tracked 282 causes of death from 1980 to 2017 (Roth et al., 2018). The paper, published in The Lancet, is the most comprehensive accounting of human mortality ever attempted. It analyzed vital registration data, verbal autopsies, cancer registries, police records, and surveillance systems. The team used statistical models called CODEm (Cause of Death Ensemble model) to estimate cause fractions and death rates for every location, year, age, and sex.

What they found upends the story we tell ourselves about global health.

Noncommunicable diseases (NCDs) now account for 73.4 percent of all deaths worldwide (Roth et al., 2018). That is nearly three out of every four people. Communicable, maternal, neonatal, and nutritional causes dropped to 18.6 percent. Injuries make up the remaining 8 percent.

But here is the part that surprised me: the total number of deaths from NCDs increased by 22.7 percent between 2007 and 2017, an additional 7.61 million deaths (Roth et al., 2018). Yet the age standardized death rate from NCDs decreased by 7.9 percent over the same period.

How can both be true? Population growth and aging. More people exist, and more of them live long enough to develop the diseases of old age. We are not dying of new things. We are dying of old things in new numbers.

The Children Who Stopped Dying

The most dramatic shift in the study is invisible to most wealthy world readers because it happened to people they never see.

Between 2007 and 2017, deaths from communicable, maternal, neonatal, and nutritional causes dropped by 22.2 percent overall, and the death rate fell by 31.8 percent (Roth et al., 2018). The biggest winners were children under five. Deaths from lower respiratory infections in that age group fell by 36.4 percent. For adults over 70, those same infections increased by 33.6 percent (Roth et al., 2018).

The pattern repeats across multiple causes. Enteric infections, tuberculosis, maternal disorders all declined faster for the young than for the old. The authors found that progress in reducing child mortality has been real and measurable. Vaccines, oral rehydration therapy, better sanitation, and insecticide treated bed nets have saved millions of lives.

But the same progress did not reach older adults. Pneumonia still kills your grandmother. Diarrhea still kills the malnourished elderly. The global health community focused on children, and it worked. The question nobody is asking: who will focus on the old?

The Rise of Self Inflicted Death

Here is the finding that made me put the paper down and stare at the wall.

Deaths from substance use disorders rose from 284,000 in 2007 to 352,000 in 2017, an increase of roughly 24 percent (Roth et al., 2018). That is not a blip. That is a trend line pointing straight up.

Meanwhile, deaths from conflict and terrorism increased by 118 percent over the same decade (Roth et al., 2018). This is not a war report. This is a mortality study. The authors counted every death from every conflict, every terrorist attack, every suicide bombing, every drone strike, every battle. The number doubled.

Put these two findings together and a disturbing picture emerges. The world has gotten much better at preventing infectious disease. It has gotten worse at preventing people from killing themselves, either slowly through addiction or quickly through violence.

The authors note that population growth contributed to increased total deaths across the 20 leading causes between 2007 and 2017. But for substance use disorders, neurological disorders, and skin and subcutaneous diseases, the cause specific mortality rate itself increased (Roth et al., 2018). More people are dying of these things per capita, not just in total numbers.

The Sex Gap Nobody Talks About

The study contains a quiet bombshell about gender.

Globally, men die at higher rates than women at almost every age. The only exception is ages over 85, where women finally catch up and surpass men in total deaths (Roth et al., 2018). This is not because women are biologically stronger. It is because men take more risks, work more dangerous jobs, and receive less healthcare in many settings.

The authors found that years of life lost (YLLs) from injuries, cardiovascular disease, and neoplasms are consistently higher for men across all regions. The gap is largest in middle income countries, where men are dying of heart attacks and strokes in their 50s and 60s while women live into their 80s.

This is not a biological inevitability. It is a policy failure. If male mortality rates matched female rates, millions of deaths per year would disappear. But nobody runs a campaign for men’s health the way they do for breast cancer or maternal mortality. The silence is deafening.

What the Study Does Not Prove

The Global Burden of Disease Study is the best data we have, but it has limits.

The authors used statistical models to redistribute deaths assigned to non specific or implausible causes. When a death certificate says “cardiac arrest” without specifying the underlying cause, the model reassigns it based on patterns in the data. This is reasonable, but it introduces uncertainty. The paper reports 95 percent uncertainty intervals for every estimate. Some of those intervals are wide.

The study also depends on the quality of vital registration systems. In countries where death registration is incomplete or unreliable, the models rely on verbal autopsies and survey data. These methods are improving but remain imperfect.

Finally, the study measures mortality, not morbidity. A disease that kills slowly but does not cause death directly may be underrepresented. Dementia, for example, is often listed as a contributing cause rather than the underlying cause of death. The authors note that neurological disorders are one of the few categories where death rates are increasing, but the true burden is probably higher than the numbers suggest.

The Epidemiological Transition Is Not Over

The concept of the epidemiological transition holds that as countries develop, they shift from dying of infectious diseases to dying of chronic diseases. The Global Burden of Disease Study confirms this transition is happening, but it is not a straight line.

In 1990, the leading causes of years of life lost were neonatal disorders, lower respiratory infections, and diarrheal diseases. By 2017, ischemic heart disease was number one, stroke was number three, and the old infectious killers had fallen to second, fourth, and fifth (Roth et al., 2018). The authors found that YLL rates decreased across all five leading causes in every socioeconomic quintile. But total YLLs increased for heart disease and stroke because population growth and aging overwhelmed the per capita improvements.

This is the key insight that most reporting misses. The death rate from heart disease is dropping in wealthy countries. But the total number of people dying from heart disease is going up everywhere. The absolute burden of chronic disease is larger than ever, even as the relative risk for any individual may be lower.

What This Actually Means

• ▸The global health community needs to shift resources toward noncommunicable diseases. The old model of fighting infectious disease in children has been wildly successful. The new model must address heart disease, cancer, diabetes, and substance use disorders in adults. The funding gap is enormous.

• ▸Men are dying preventable deaths at higher rates than women across almost every cause. This is not a biological inevitability. It is a policy blind spot. Targeted interventions for men’s health, particularly in middle age, could save millions of lives per year.

• ▸Substance use disorders and conflict are growing threats that require political solutions, not just medical ones. The doubling of conflict deaths and the steady rise of addiction deaths reflect failures of governance, not failures of medicine.

• ▸Aging populations will drive future mortality trends. As more countries reach low fertility and high life expectancy, the burden of neurological disorders, falls, and chronic diseases will increase. Health systems designed for infectious disease outbreaks are not prepared for this.

• ▸Progress in child mortality is real but fragile. The gains against lower respiratory infections and diarrheal diseases in children under five are among the greatest achievements in human history. Maintaining them requires continued investment in vaccines, sanitation, and primary care.

The way we die has changed more in the last 40 years than in the previous 400. The Global Burden of Disease Study is the map of that transformation. The question is whether we will read it before we repeat the mistakes it reveals.