Nathan López Bezerra
A sweeping new analysis published in JAMA Neurology reveals that brain and nervous system conditions are now nearly universal in the United States. According to the data, more than half of all Americans, approximately 180 million people, are currently living with at least one neurological disease or disorder.
The findings come from the Global Burden of Disease 2021 study, one of the largest health datasets. Researchers analyzed U.S. data from 1990 to 2021, evaluating 36 conditions that affect the brain, spinal cord, and peripheral nerves.
The study measured disability-adjusted life years (DALYs), a metric that captures both years lost to early death and years lived with disability. It found that disorders affecting the nervous system were the leading cause of disability in the United States, accounting for 16.6 million DALYs in 2021 alone.
The most common neurological conditions in the U.S. were tension-type headaches, affecting about 122 million Americans; migraine, affecting about 58 million; and diabetic neuropathy, affecting about 17 million. These conditions often begin earlier in life and can disrupt daily functioning and quality of life.
The conditions responsible for the greatest overall health loss were stroke, Alzheimer’s disease and other dementias, diabetic neuropathy, and migraine. This highlights a dual challenge of both widespread prevalence and severity for certain disorders.
While the total number of Americans with neurological conditions has risen, the age-adjusted prevalence has stayed essentially flat over the past 30 years and even declined slightly. This indicates people are not suddenly more likely to develop these conditions.
The primary driver for the increase is an aging population. Many neurological conditions, including stroke, dementia, and neuropathy, are far more common later in life. At the same time, deaths from neurological diseases have dropped by about 15% since 1990, due to better prevention, faster diagnosis, and advances in treatment.
The result is that more people are surviving neurological conditions and living with them for longer. Years lived with disability increased by nearly 10%, underscoring a growing need for better long-term management and support systems.
A growing body of research shows that brain health is influenced by everyday choices, with many factors that protect heart and metabolic health also supporting the nervous system. These include managing blood sugar and blood pressure, regular physical activity, prioritizing sleep, eating a diet with omega-3s and antioxidants, and staying socially and cognitively engaged.
The analysis underscores that brain health is a widespread concern touching nearly every family. Neurological conditions are common, long-lasting, and intertwined with daily life and aging. The data also shows that the burden is not fixed, as many leading drivers of neurological disability are influenced by factors that can be addressed earlier in life through consistent lifestyle choices.
The study’s focus on disability-adjusted life years provides a broader understanding of public health impact beyond simple diagnosis counts. This metric helps policymakers and health professionals allocate resources for conditions that, while not always fatal, create a substantial long-term burden on individuals and the healthcare system. Tracking these trends over decades is vital for shaping effective national health strategies.
