Surgery is not only for rare or complex illness. Caesarean delivery, emergency abdominal operations, the treatment of open fractures and injuries, and cancer operations are part of everyday health care, and each needs a trained team, anaesthesia, a working operating theatre and safe follow-up. The Lancet Commission on Global Surgery estimated in 2015 that 5 billion people do not have access to safe, affordable surgical and anaesthesia care when they need it, and that conditions needing surgical care caused about 16.9 million deaths in 2010, a third of all deaths worldwide. WHO now estimates that conditions which timely emergency, critical and operative care could address cause 38 million deaths a year. A 2025 review found no sign that the access estimate has improved, put the unmet need at no fewer than 160 million operations a year, and estimated that 3.5 million adults die within 30 days of surgery each year, which shows that safety after an operation matters as much as access to one.
The gap follows income. Of roughly 313 million operations performed worldwide in 2012, only 6.3% took place in the countries home to the poorest 37.3% of the world's population, and the unmet need is largest in sub-Saharan Africa, followed by South and Southeast Asia. Where human development is lowest, surgery is dominated by childbirth: obstetric procedures make up 35% of operations in those countries, against 7% in the countries with the highest human development. Paying for care is a second barrier. An estimated 81.3 million people a year face catastrophic spending to get surgery, 48.5 million of them because of the non-medical costs of reaching and staying at a hospital, and within every country the burden falls on the poor. Untreated surgical conditions also cost economies dearly: the Commission projected US$12.3 trillion in lost output for low- and middle-income countries between 2015 and 2030.
How access to surgery is measured
The Lancet Commission on Global Surgery defined surgical care broadly, to include operations, anaesthesia, obstetric care and the management of surgical conditions without operating. Access means that care exists, can be reached in time, is safe and is affordable. In 2015 the Commission proposed six indicators with targets for 2030, grouped here into four:
Timely access to essential surgery
The share of the population that can reach, within two hours, a facility able to perform three 'bellwether' procedures: caesarean delivery, laparotomy (opening the abdomen) and treatment of an open fracture. The target is at least 80% coverage in every country by 2030.
Specialist surgical workforce
The number of specialist surgeons, anaesthetists and obstetricians per 100,000 people, with a target of at least 20 in every country by 2030. It leaves out non-physician providers such as nurse anaesthetists, who account for 2.3 of the 8.8 anaesthesia providers per 100,000 people worldwide.
Surgical volume and perioperative mortality
The number of operations per 100,000 people, with a benchmark of at least 5,000 a year, and the perioperative mortality rate, the share of patients who die after surgery. Unmet need is estimated as the gap between a country's volume and the benchmark, so it measures capacity, not every individual's need.
Protection from catastrophic and impoverishing costs
The share of people who would face catastrophic spending (out-of-pocket costs above a set share of income) or be pushed into poverty if they needed surgery. These are modelled estimates, not survey counts, and they depend strongly on how catastrophic spending is defined.