The 10 Leading Causes of Death Worldwide
Heart disease kills more people than any other condition on Earth. Here are the top 10 causes, which are rising, which are falling, and what can be prevented.
The Global Picture
Of the roughly 62 million people who die each year, the vast majority are killed by a relatively small number of conditions. The top 10 causes account for over 55% of all deaths worldwide, according to the WHO Global Health Estimates.
Understanding these causes is not just an academic exercise. Many of them are preventable. Here is the full list.
The Top 10
1. Ischaemic Heart Disease — 8.9 million deaths/year
Coronary artery disease remains the world's number one killer, responsible for roughly 16% of all deaths. It occurs when fatty deposits narrow the arteries supplying blood to the heart.
Trend: Stable globally, but rising in low- and middle-income countries as diets shift towards processed food and physical activity declines. Falling in Western Europe and North America due to better treatment and statins.
2. Stroke — 6.9 million deaths/year
Stroke — both ischaemic (blocked blood vessel) and haemorrhagic (bleeding) — is the second leading cause of death and the leading cause of long-term disability.
Trend: Declining in high-income countries. Rising in sub-Saharan Africa and South Asia.
3. Chronic Obstructive Pulmonary Disease (COPD) — 3.6 million deaths/year
COPD is almost entirely caused by smoking and air pollution. It kills more people than lung cancer.
Trend: Slowly declining as smoking rates fall globally, but still rising in countries where tobacco use is increasing, particularly in Asia.
4. Lower Respiratory Infections — 2.6 million deaths/year
Pneumonia and bronchiolitis remain devastating in children under five and adults over 70. This category dropped significantly during and after COVID-19 interventions, though the decline was partially offset by COVID pneumonia itself.
Trend: Falling, thanks to improved vaccination (pneumococcal, Hib) and better access to antibiotics.
5. Neonatal Conditions — 2.3 million deaths/year
Deaths in the first 28 days of life, caused by preterm birth complications, birth asphyxia, and neonatal sepsis. Nearly all of these deaths occur in low-income countries.
Trend: Declining steadily, but not fast enough. Sub-Saharan Africa and South Asia account for over 75% of neonatal deaths.
6. Trachea, Bronchus, and Lung Cancers — 1.9 million deaths/year
Lung cancer is the deadliest cancer in the world, and smoking is responsible for approximately 85% of cases.
Trend: Falling in men (as smoking declines), but rising in women in several regions where female smoking rates peaked later.
7. Diabetes Mellitus — 1.6 million deaths/year
Type 2 diabetes has exploded globally. It is now a top-10 killer, up from 15th place in 2000. Obesity, sedentary lifestyles, and processed food are the primary drivers.
Trend: Rising sharply — one of the fastest-growing causes of death worldwide. For more detail, see our causes page.
8. Road Traffic Injuries — 1.35 million deaths/year
Road crashes kill more young people aged 15 to 29 than any other cause. Low- and middle-income countries bear 93% of the burden despite having only 60% of the world's vehicles.
Trend: Slowly declining globally, but rising in Africa. Seatbelt laws, speed limits, and drink-driving enforcement have been effective where implemented.
9. Diarrhoeal Diseases — 1.3 million deaths/year
Diarrhoea is still a leading killer of children under five, despite being almost entirely preventable with clean water, sanitation, and oral rehydration salts.
Trend: Falling significantly — deaths have halved since 2000.
10. Alzheimer's Disease and Other Dementias — 1.3 million deaths/year
As populations age, dementia is climbing rapidly up the rankings. It is now the 7th leading cause of death in high-income countries.
Trend: Rising steeply, driven by ageing populations. There are currently no treatments that significantly slow disease progression.
What Is Rising, What Is Falling
Rising causes:
- Diabetes (+70% since 2000)
- Dementia (+145% since 2000)
- Drug use disorders (particularly opioid overdoses in North America)
- Kidney disease
Falling causes:
- HIV/AIDS (-52% since peak in 2004)
- Tuberculosis (-30% since 2000)
- Diarrhoeal diseases (-50% since 2000)
- Malaria (-25% since 2000)
- Road traffic injuries (-modest decline)
What Can Be Prevented
The WHO estimates that roughly 50% of all deaths are attributable to modifiable risk factors. The biggest ones:
- Tobacco — responsible for over 8 million deaths per year (direct smoking plus secondhand exposure)
- High blood pressure — linked to 10.8 million deaths per year
- Air pollution — causes roughly 7 million premature deaths annually
- Diet — poor diet (high sodium, low fruit, low whole grains) contributes to 11 million deaths per year
- Physical inactivity — a contributing factor in 3.2 million deaths per year
In other words, the majority of the world's leading killers are not inevitable. They are the consequence of how we eat, move, breathe, and regulate harmful substances.
Explore the full breakdown on our causes of death page.
Sources: WHO Global Health Estimates (2024), The Lancet Global Burden of Disease Study (2024), WHO Fact Sheets on individual causes.