SUS: how Brazil's health system serves an entire country

A child vaccinated at the neighborhood health clinic. A worker rescued by the SAMU emergency service after an accident. A patient who receives a heart transplant without paying a cent for the surgery. A person living with HIV who picks up their medication free of charge every month. These scenes are so common in Brazil that we rarely stop to think about what they have in common: all of them happen within the Unified Health System, the SUS. The SUS is at once Brazil's largest public policy and one of the boldest experiments in collective health on the planet — a system that sets out to provide universal, comprehensive care to a country of more than 200 million people. Understanding how it works, where it came from and why it is considered unique in the world means understanding an essential part of Brazil itself.

Before the SUS: health care only for those with a formal job

It was not always this way. For much of the 20th century, access to health care in Brazil depended on ties to the formal labor market. Those with a registered job contributed to social security and were treated by the network linked to the pension system — in its final phase, by INAMPS, the National Institute of Medical Assistance of Social Security. Those outside that circuit, such as rural workers, informal workers and the unemployed, depended on charity: they were the so-called indigents, cared for mainly by the Santas Casas de Misericórdia charity hospitals and by philanthropic services.

This exclusionary model began to be challenged by a movement of physicians, public health experts, university professors and patients that became known as the Sanitary Reform. The symbolic turning point was the 8th National Health Conference, held in 1986, at the height of Brazil's return to democracy, which enshrined the idea that health is a right of all and a duty of the State — not a commodity, nor a benefit reserved for those who contribute.

What the 1988 Constitution changed

The 1988 Constitution turned that banner into law. Its text defines health as a right of all and a duty of the State, guaranteed through policies that reduce the risk of disease and ensure universal, equal access to health actions and services. Two years later, the 1990 Organic Health Law organized how the system would operate, and a second law passed that same year guaranteed community participation in its governance, through health councils and conferences.

In practice, the SUS is a single network linking the three levels of government. The federal government sets national policy and provides a significant share of the funding; the states coordinate regional networks and higher-complexity services; and the municipalities, the system's front door, run health clinics, primary care teams and a large share of the hospitals. This decentralization is one of the hallmarks of the Brazilian design: health care is delivered close to where people live.

The principles that hold the system up

Three doctrinal principles sum up the philosophy of the SUS:

• Universality: everyone is entitled to care, without exception. Income, contributions, employment and even nationality do not matter — tourists and foreigners on Brazilian soil are treated as well.
• Comprehensiveness: the system must care for the whole person, from prevention to rehabilitation. That includes vaccines, appointments, tests, highly complex surgery, mental health care and medication.
• Equity: treating unequal people unequally. Those who need more should receive more attention, in order to reduce the country's enormous regional and social disparities.

These principles are joined by organizational guidelines, such as decentralization across the levels of government, the regionalization of care networks and social oversight — the participation of patients, health workers and administrators in health councils, a rare feature among health systems around the world.

Why the SUS is unique in the world

Universal health systems exist in several countries — the most frequently cited example is Britain's NHS, which served as inspiration for the Brazilian model. The difference lies in scale and scope. No other country with a population in the hundreds of millions maintains a public system that is universal, comprehensive and free at the point of care like Brazil's. Populous nations such as the United States, India, Indonesia and Nigeria have no comparable universal public coverage; countries with robust universal systems, such as the United Kingdom, Canada and the Scandinavian nations, have far smaller populations.

The system's reach is just as striking. The SUS is not limited to appointments and emergencies: it encompasses the National Immunization Program, one of the largest public vaccination programs in the world, responsible for campaigns that helped eliminate diseases such as polio from the national territory; one of the planet's largest public organ transplant systems; the free distribution of antiretroviral drugs to people with HIV, a pioneering policy launched in the 1990s that became an international benchmark; the Family Health Strategy, with community health workers who visit homes across the country; the SAMU emergency service; the health surveillance service that inspects food and medicines; epidemic control; blood banks; and the regulation of private health plans.

The invisible SUS that every Brazilian uses

There is a common misconception: believing that people with private health insurance do not use the SUS. They do — every day. It is the SUS that inspects the quality of the medicine bought at the pharmacy, guarantees the safety of the blood used in any hospital, responds to outbreaks and epidemics, runs the mass vaccination campaigns and funds most transplants and high-cost treatments, even for those with private coverage. The public system is the health infrastructure on which all of Brazilian health care, private care included, is built.

The real challenges

Recognizing the greatness of the SUS does not mean ignoring its problems — and the biggest one is chronic: funding. Brazil's public spending on health, as a share of the economy, is lower than the average of countries that maintain universal systems, and the private sector accounts for a substantial share of the country's total health spending — an unusual combination for a system that aims to be universal. The result shows up in the waiting lines for tests and elective surgeries, in the difficulty of keeping doctors in remote regions, in the gap between the services available in the major state capitals and in the interior, and in the so-called judicialization of health, when patients turn to the courts to obtain treatments and medication.

Even so, most of Brazil's population depends exclusively on the public system for its care. For these people, the SUS is not an acronym: it is the only door available when health fails.

What is at stake for the reader

Debating the SUS means debating Brazil's social contract. Every decision about the public budget, every constitutional amendment that changes spending rules, every municipal management choice directly affects the line at the clinic, the vaccine stockpile and the waiting time for surgery.

The SUS was born of a collective decision written into the Constitution: that no Brazilian should have to depend on luck or on a paycheck to have the right to health. Nearly four decades later, the system remains imperfect, underfunded and indispensable. It is at once the country's greatest social asset and its most enduring challenge — and what it will be tomorrow depends, in large part, on how well Brazilians know and defend what they have built.