It’s called Lou Gehrig’s disease because Lou Gehrig, one of the most famous baseball players in American history, was diagnosed with amyotrophic lateral sclerosis (ALS) in 1939 and brought unprecedented public attention to a condition most people had never heard of. His fame, his dramatic farewell from baseball, and his death just two years later permanently linked his name to the disease in the United States.
Who Lou Gehrig Was
Lou Gehrig played first base for the New York Yankees from 1923 to 1939. He was one of the most dominant hitters of his era and held the record for most consecutive games played (2,130) for 56 years. He was, in short, the kind of athlete whose sudden physical decline would shock the entire country.
During the 1938 season, something was clearly wrong. Gehrig struggled to hit and field for much of the year, finishing with a .295 batting average, 29 home runs, and 114 runs batted in. For most players, those numbers would be respectable. For Gehrig, they were unusually low. By early 1939 the decline was impossible to ignore, and he removed himself from the Yankees’ lineup in May.
The Diagnosis at Mayo Clinic
On June 19, 1939, his 36th birthday, Gehrig and his wife Eleanor visited the Mayo Clinic in Rochester, Minnesota. Doctors diagnosed him with amyotrophic lateral sclerosis, a progressive neurological disease that destroys the nerve cells controlling voluntary movement. At the time, ALS was a rare and poorly understood condition with almost no public profile.
Just two weeks later, on July 4, 1939, Gehrig stood in front of a packed Yankee Stadium and delivered what became one of the most famous speeches in American sports history. Despite facing a fatal diagnosis, he told the crowd he considered himself “the luckiest man on the face of the earth.” The speech was broadcast on radio and covered in newspapers across the country, and it gave millions of Americans their first exposure to the disease.
Gehrig died in June 1941, not quite 38 years old. The speed of his decline, combined with his status as a national figure, cemented the association between his name and the disease. Americans began calling ALS “Lou Gehrig’s disease” almost immediately, and the name stuck for decades.
Why the Name Is Mainly American
The nickname “Lou Gehrig’s disease” is largely a North American phenomenon. In most of the world, the condition is simply called ALS or motor neuron disease (MND). The National Institute of Neurological Disorders and Stroke now describes ALS as “formerly known as Lou Gehrig’s disease,” reflecting a gradual shift toward using the medical name even in the U.S. Still, the colloquial name remains widely recognized and frequently used by patients, advocacy groups, and the media.
What ALS Actually Does
ALS destroys motor neurons, the nerve cells in the brain and spinal cord that send signals telling your muscles to move. As these neurons degenerate, muscles weaken and waste away. The disease affects both the upper motor neurons in the brain and the lower motor neurons in the brainstem and spinal cord, which is why it causes a combination of muscle stiffness, twitching, and progressive weakness.
The name “amyotrophic lateral sclerosis” describes exactly what happens in the body. “Amyotrophic” means muscle wasting. “Lateral” refers to the areas of the spinal cord where the affected nerve fibers run. “Sclerosis” means scarring or hardening, which is what happens to those spinal cord regions as the neurons die off. The disease typically begins with weakness in a hand, foot, or the muscles used for speaking and swallowing, then gradually spreads to the rest of the body.
How Common ALS Is Today
ALS remains relatively rare but not as uncommon as many people assume. The CDC estimates that roughly 33,000 people in the United States were living with ALS as of 2022, and that number is projected to rise by more than 10% to over 36,000 cases by 2030. Average survival ranges from two to five years after symptoms begin, with a median of about two to three years from onset. Registry data from long-term studies shows modest improvement in survival over recent decades, likely due to better multidisciplinary care at specialized ALS centers rather than any single breakthrough treatment.
Diagnosing ALS can be slow. There is no single test that confirms it. Doctors rely on clinical criteria that assess signs of both upper and lower motor neuron damage across multiple body regions, often supplemented by electrical tests of muscle and nerve function. The average diagnostic delay is close to a year from the time symptoms begin, partly because early symptoms like muscle weakness or cramping can mimic many other conditions.
How the Name Shaped Awareness
Gehrig’s connection to the disease did something unusual: it gave a rare, obscure illness a permanent place in public consciousness. Before 1939, most Americans had no reason to know what ALS was. After Gehrig’s diagnosis and farewell speech, the disease had a face and a story that people remembered. That awareness helped drive early fundraising and research efforts, and it laid the groundwork for organizations like the ALS Association.
The 2014 Ice Bucket Challenge brought a second massive wave of awareness, but even that campaign leaned heavily on the “Lou Gehrig’s disease” label to help people understand what ALS was. More than 75 years after his death, Gehrig’s name still serves as a shorthand that makes a complex neurological disease instantly recognizable to millions of people who might otherwise never encounter it.