Consumption is an old name for tuberculosis, a bacterial infection that primarily attacks the lungs. The term was used for centuries because the disease seemed to literally consume the body from within, causing dramatic weight loss, wasting, and a slow decline toward death. It was the leading killer in industrialized countries throughout the 1800s, responsible for roughly 40% of working-class deaths in cities.
Why It Was Called Consumption
Before doctors understood bacteria or how infections spread, they named diseases by what they could see. A person with tuberculosis would gradually lose weight, grow pale, develop a persistent cough (often bloody), and waste away over months or years. The body appeared to be consuming itself. The term “phthisis,” from the Greek word for decay, was used interchangeably with consumption through the 17th and 18th centuries. It wasn’t until the mid-1800s that a German physician coined the word “tuberculosis,” based on the small lumps, or tubercles, found in the lungs of patients who had died from the disease.
That wasting effect wasn’t just visible. It was the defining feature. Modern research confirms that about 87.5% of people with active tuberculosis experience unintentional weight loss. The infection drives the body’s energy expenditure sharply upward while simultaneously suppressing appetite through hormonal changes. More than three-quarters of patients with active disease report reduced appetite. The result is a double hit: the body burns more calories fighting the infection while taking in far less food. This is why wasting remains one of the strongest predictors of how severe the disease becomes.
The Bacterium Behind the Disease
For most of human history, no one knew what caused consumption. Some blamed bad air, heredity, or emotional distress. In 1720, an English physician named Benjamin Marten first suggested the disease might be infectious, but the idea didn’t gain traction. It took another 160 years for proof. On March 24, 1882, Robert Koch announced to the Berlin Physiological Society that he had identified the specific bacterium responsible: Mycobacterium tuberculosis. He had observed the bacillus in every case of the disease, grown it in a laboratory, and then used a pure culture to reproduce the disease in a healthy animal. These steps became the foundation of “Koch’s postulates,” still the standard framework for proving that a specific germ causes a specific disease.
Koch’s discovery transformed consumption from a mysterious wasting illness into something that could, at least in theory, be fought. It shifted the medical conversation from managing symptoms to understanding transmission and, eventually, developing treatments.
How Consumption Was Treated Before Antibiotics
Before antibiotics existed, there was no cure. The primary strategy was the sanatorium: a dedicated facility, usually at high altitude, where patients were isolated from their families and communities. Doctors at the time believed the disease was less common above 1,000 meters, so mountain locations were preferred. Treatment consisted of isolation, clean air, sunshine, rest, and enormous amounts of food. Patients were sometimes prescribed 6,000 calories a day in an attempt to counteract the wasting.
The sanatorium era dominated the early 20th century. These facilities served a dual purpose: giving patients the best chance at recovery while also containing the spread of infection. Inside, patients had access to chest X-rays and, in severe cases, surgery. The most notable surgical technique was therapeutic pneumothorax, in which doctors deliberately collapsed a diseased lung to allow it to rest and heal. Lobectomies, the removal of entire sections of lung, were also performed, though surgical techniques of the time made these procedures risky. Lengthy rehabilitation programs followed.
Some public health advocates pushed for a different model entirely. One early Italian physician argued that patients should be allowed to live with their families in modern, hygienic homes with their own rooms that were disinfected regularly. This tension between institutional isolation and home-based care would persist until effective drug treatments finally arrived in the mid-20th century.
The Scale of Death in the 1800s
It’s difficult to overstate how dominant consumption was as a cause of death. Throughout the 19th and early 20th centuries, tuberculosis killed more people in industrialized nations than any other disease. In cities, where crowded housing and poor sanitation created ideal conditions for the bacterium to spread, roughly 4 in 10 working-class deaths were attributed to it. The disease earned yet another name during this period: the “white plague,” a reference to the extreme pallor of its victims.
Mortality rates began declining in the late 1800s, even before Koch identified the bacterium, largely due to improvements in sanitation, nutrition, and living conditions. The discovery of effective antibiotics in the mid-20th century accelerated that decline dramatically in wealthier countries.
Tuberculosis Today
Consumption never disappeared. It simply changed its name and shifted its geography. According to the World Health Organization’s 2024 report, tuberculosis returned to being the world’s leading infectious disease killer in 2023, surpassing COVID-19. The burden falls overwhelmingly on low- and middle-income countries, where diagnosis still relies on techniques over a century old. In some isolated regions, the only available diagnostic tools are a microscope examination of sputum, a chest X-ray, and clinical observation of symptoms, not far removed from what 19th-century physicians used.
For detecting latent infection, where the bacterium is present but not yet causing symptoms, a tuberculin skin test remains the standard method. Newer blood-based tests offer improved accuracy but aren’t widely available in the places that need them most. Active tuberculosis is now treatable with a multi-drug antibiotic regimen lasting several months, but drug-resistant strains have become a growing concern, making treatment longer, more complex, and less certain.