Health & Medicine
Hospitals, medicines, lifespans, and the numbers behind human health.
The Most Polluted Cities in the World
Loni, India had the world's most polluted air in 2025, averaging 112.5 µg/m³ of PM2.5, more than 22 times the WHO guideline, ahead of Hotan, China (109.6) and Byrnihat, India (101.1), as of November 2026.
View ranking →The Countries with the Most Doctors per Person
Physicians per 1,000 people, using each country's latest value from 2018 to 2025 (World Bank / WHO). Cuba leads at 9.54, ahead of Seychelles (6.60) and Greece (6.58); countries under 100,000 people are excluded and physician definitions vary.
View ranking →The Countries That Spend the Most on Healthcare per Person
Health spending per person in 2023, in PPP international dollars (World Bank / WHO). The United States leads at $13,473, ahead of Switzerland ($10,602) and Monaco ($9,797); the OECD average is $6,929.
View ranking →The Largest Health Insurers in the United States
UnitedHealth Group led US health insurers with $447.6 billion in FY2025 revenue, ahead of CVS Health ($402.1B) and Cigna ($274.9B): 12 insurers ranked by total revenue from company results, as of October 28, 2026.
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The Best-Selling Prescription Drugs in the World
Merck's Keytruda led 2025 global sales at $31.7 billion, ahead of Lilly's Mounjaro and the BMS-Pfizer Eliquis: 12 prescription drug brands ranked by company-reported net sales for calendar year 2025.
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The Leading Causes of Death in the United States
Heart disease caused 683,491 US deaths in 2024, 22.2 percent of 3,072,666 deaths, ahead of cancer (619,876) and unintentional injuries (197,449): the CDC's final 2024 top 10 by deaths, share and death rate.
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The Largest Hospitals in the World by Bed Count
Reported capacities put Manila's National Center for Mental Health first with 4,200 beds, ahead of Ankara Etlik, Linkou Chang Gung and Lucknow's KGMU: 11 single hospital campuses ranked by dated bed counts.
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The Deadliest Cancers in the United States
Lung cancer is estimated to cause about one in five US cancer deaths in 2026, more than colorectal and pancreatic cancer combined. These are the American Cancer Society's statistical estimates, not counts, ranked by estimated deaths.
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The Tallest Hospital Buildings in the World
From Mexico's 179-meter Hospital Ángeles Andares to Denmark's Herlev Hospital, the 19 tallest hospital and medical buildings in the world, ranked by architectural height. Houston alone has five of them.
View ranking →The Most Prescribed Medications in the United States
Estimated US outpatient prescriptions filled in 2023, by generic drug, from the ClinCalc DrugStats database built on the federal Medical Expenditure Panel Survey: atorvastatin leads with about 115 million.
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The Asian Countries with the Highest Prostate Cancer Rates
New prostate cancer cases per 100,000 men, age-standardised, from IARC's GLOBOCAN 2022 estimates. Cyprus, Japan and Israel lead the 12 highest-rate countries in Asia, using the UN and IARC definition of the region.
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The Deadliest Pandemics and Epidemics in History
The 13 deadliest outbreaks on record, ranked by the midpoint of published death-toll estimates, from smallpox and the Black Death to the Spanish flu, HIV/AIDS and COVID-19. Early-history figures are scholarly estimates with wide ranges.
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