Top 10 Leading Causes of Death Worldwide (WHO 2025)

Several causes here — diarrhoeal disease, tuberculosis, and lower respiratory infections — are overwhelmingly preventable or curable with existing, cheap interventions: vaccines, oral rehydration, antibiotics. Others, including Alzheimer's disease and most advanced cardiovascular disease and cancer, currently have no cure and rely on earlier detection and risk reduction rather than treatment. Knowing which bucket a cause falls into changes what "doing something about it" actually looks like: public health infrastructure for one group, screening and lifestyle change for the other.

In high-income countries, this list is dominated by heart disease, stroke, cancers, and dementia. In low-income countries, lower respiratory infections, diarrhoeal disease, and tuberculosis claim a far larger share of deaths than their position in this combined global ranking suggests. The global top 10 is an average of two quite different mortality profiles, not a single consistent picture for any one country — a national health ministry and a global health body would draw different priorities from the same list.

Diabetes is a good example: it's credited here with about 1.6 million direct deaths, but it also drives large numbers of deaths that get coded elsewhere on this list, under heart disease, stroke, and kidney disease, since diabetes is a major risk factor for all three. These are causes of death as coded on a death certificate, not fully independent buckets — the real health burden of a condition like diabetes is larger than its own line item on this list suggests.