The number one killer in the world is Cardiovascular Disease (CVD), specifically ischaemic heart disease, responsible for millions of deaths annually and remaining the leading cause across most regions despite the rise of other conditions like dementia and COVID-19. CVD accounts for about one-third of global deaths, with heart attacks and strokes being the main culprits, often linked to lifestyle factors like poor diet, stress, and inactivity.
This first table gives a convenient overview of the general categories and broad causes. The leading cause is cardiovascular disease at 31.59% of all deaths.
Heart disease is the leading cause of death for men in the United States, accounting for 25 percent of all male deaths. Various factors, including smoking, high cholesterol levels and obesity, can cause heart disease.
According to the American Heart Association's 2025 Heart Disease and Stroke Statistics Update, heart disease remains the leading cause of death in the U.S.
Dementia (including Alzheimer's disease) is now Australia's leading cause of death overall, closely followed by ischaemic heart disease, with the gap narrowing as the population ages; however, coronary heart disease remains the top killer for males, while dementia leads for females. Other major causes include cerebrovascular disease (stroke), lung cancer, and chronic lower respiratory diseases (COPD).
Taken together, heart diseases and cancers are the cause of every second death. In red are infectious diseases, which are responsible for around 1-in-7 deaths. These include pneumonia, diarrheal diseases, tuberculosis, HIV/AIDS, and malaria. A smaller share – around 4% – was from neonatal and maternal deaths.
Four in five suicides are by men – suicide is the biggest cause of death for men under 35 and there has been a sharp increase in the rate among men aged 35-64. Men are more likely than women to: smoke, smoke more cigarettes per day and smoke hand-rolled tobacco. eat too much salt.
Lung and bronchus, colorectal, pancreatic, and breast cancers are responsible for nearly 50% of all deaths.
What are the death rates for the 10 leading causes of death? In 2023, the 10 leading causes of death remained the same as in 2022. The top leading cause in 2023 was heart disease, followed by cancer and unintentional injuries (Figure 4, Table 4).
The assassination of the Austrian Archduke Franz Ferdinand in 1914 was the immediate cause of the First World War. For four years, the great European powers fought a gruesome battle.
Death rate - Country rankings
The average for 2022 based on 196 countries was 8.24 deaths per 1000 people. The highest value was in the Central African Republic: 55.13 deaths per 1000 people and the lowest value was in Qatar: 0.93 deaths per 1000 people.
World War II was the deadliest conflict in human history marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China.
Dementia is the UK's biggest killer. Yet one in three people are living without a diagnosis. For those that do receive a diagnosis, the journey to that point can be filled with heartbreak, frustration and uncertainty - over weeks, months and even years.
Globally, Ischaemic Heart Disease (Coronary Artery Disease) remains the world's biggest killer, but regionally, Dementia (including Alzheimer's) has recently become the leading cause of death in countries like Australia, surpassing heart disease for females and overall, while heart disease leads for males. Other top causes globally include stroke, respiratory infections, lung cancer, and chronic obstructive pulmonary disease (COPD).
The number one killer in the world is cardiovascular disease (CVD), including heart disease and stroke, responsible for about one-third of all global deaths, claiming nearly 18-20 million lives annually, and remains the leading cause across all regions, according to WHO and World Heart Federation. While COVID-19 caused significant deaths in recent years, CVD has consistently held the top spot for decades, with increases seen globally, especially in younger populations.
Incurable cancers are those that current treatments cannot completely eliminate, often because they are advanced (spread) or have returned after initial treatment, but they are not necessarily untreatable; treatments like chemo, radiation, and new targeted therapies aim to control the disease, slow growth, relieve symptoms, and improve quality of life. Common examples of cancers often considered incurable include pancreatic, liver, brain, esophageal, and certain advanced lung cancers, but research continuously offers new hope, with many patients living longer with ongoing management.
However, we also know that there are ways to reduce your risk of developing 5 of the 6 less survivable cancers.
The Heaviest Hitters
In the United States in 2021, the death rate was highest among those aged 85 and over, with about 17,190.5 men and 14,914.5 women per 100,000 of the population passing away.
Mosquitos are by far the deadliest creature in the world when it comes to annual human deaths, causing around one million deaths per year, compared to 100,000 deaths from snakes and 250 from lions. Perhaps surprising, dogs are the third deadliest animal to humans.
Most reported cases of man-eaters have involved lions, tigers, leopards, polar bears, and large crocodilians.
Record numbers of men and women globally are now estimated to have reduced kidney function, a new study shows. Figures rose from 378 million people with the disease in 1990 to 788 million in 2023 as the world population grew and aged, making it for the first time a top 10 cause of death worldwide.