Neurological diseases collectively cause over 11 million deaths each year, making conditions of the nervous system one of the largest health burdens on the planet. The Global Burden of Disease Study 2021, the most comprehensive analysis of its kind, ranked the top 10 neurological conditions by their combined toll of death and disability. In order, they are: stroke, neonatal encephalopathy, migraine, Alzheimer’s disease and other dementias, diabetic neuropathy, meningitis, epilepsy, neurological complications from preterm birth, autism spectrum disorder, and cancers of the nervous system.
Here’s what each of these conditions involves and why it ranks so high.
1. Stroke
Stroke tops the list by a wide margin. In 2021 alone, 11.9 million new strokes occurred worldwide, making it the third leading cause of death and disability globally. A stroke happens when blood flow to part of the brain is cut off, either by a clot blocking a vessel (ischemic stroke, the most common type) or by a vessel rupturing and bleeding into the brain (hemorrhagic stroke). Within minutes, brain cells in the affected area begin to die, which is why speed of treatment determines whether someone recovers fully, lives with lasting disability, or dies.
High blood pressure is the single biggest modifiable risk factor. Smoking, diabetes, high cholesterol, physical inactivity, and heavy alcohol use all raise the odds. Because so many of these risk factors are tied to lifestyle and metabolic health, stroke burden falls disproportionately on low- and middle-income countries where prevention and emergency care are harder to access.
2. Neonatal Encephalopathy
Neonatal encephalopathy refers to brain injury that occurs around the time of birth, most often from oxygen deprivation during labor or delivery. It ranks second because the consequences can last a lifetime: cerebral palsy, intellectual disability, seizure disorders, and developmental delays. In severe cases, it’s fatal within days. The burden is heaviest in regions with limited access to skilled birth attendants and neonatal intensive care, which is why it remains one of the top neurological concerns globally despite being relatively rare in high-income countries.
3. Migraine
Migraine is the third-highest cause of neurological disability worldwide. Headache disorders overall affect roughly 40% of the global population, about 3.1 billion people, and migraine accounts for the largest share of that burden. While migraine doesn’t kill, it causes enormous disability. A severe attack can involve intense throbbing pain, nausea, vomiting, and extreme sensitivity to light and sound lasting anywhere from hours to days. Many people experience multiple attacks per month.
Because migraine peaks during working-age years (roughly 25 to 55) and is two to three times more common in women, its economic impact is staggering. Lost productivity, missed work days, and reduced quality of life push migraine far higher on disability rankings than conditions that are more deadly but less disabling day to day.
4. Alzheimer’s Disease and Other Dementias
An estimated 7.1 million Americans currently live with symptoms of Alzheimer’s, and that number is projected to nearly double to 13.9 million by 2060. Globally, the picture is similar: aging populations are driving rapid growth in dementia cases everywhere. Alzheimer’s accounts for 60 to 70% of all dementia. It progressively destroys memory, reasoning, and the ability to carry out daily activities. In later stages, people lose the ability to communicate, recognize loved ones, or care for themselves at all.
The disease typically develops over 10 to 20 years, with the earliest brain changes occurring long before symptoms appear. There is no cure, though newer treatments can modestly slow progression in some people with early-stage disease. The caregiving burden is immense, often falling on family members for years.
5. Diabetic Neuropathy
About 36% of people with diabetes develop peripheral neuropathy, nerve damage that typically starts in the feet and hands. High blood sugar over time injures small blood vessels that supply nerves, leading to tingling, numbness, burning pain, and eventually loss of sensation. That loss of feeling is dangerous: people may not notice wounds on their feet, leading to infections and, in serious cases, amputations.
With diabetes rates climbing worldwide, diabetic neuropathy has become one of the most common neurological conditions on the planet. People with chronic kidney disease alongside diabetes face an even higher risk. The most effective prevention is consistent blood sugar control, but for the hundreds of millions of people with limited access to diabetes management, neuropathy remains a major source of disability.
6. Meningitis
Meningitis is an infection of the membranes surrounding the brain and spinal cord. Bacterial meningitis can kill within hours if untreated and leaves roughly one in five survivors with lasting damage: hearing loss, brain injury, limb amputations, or seizures. Viral meningitis is far more common and usually less severe, though it can still cause prolonged illness.
Children and young adults are most vulnerable. Sub-Saharan Africa’s “meningitis belt” sees regular outbreaks, though effective vaccines exist for several of the most dangerous bacterial strains. The disease ranks this high on the global burden list because of its combination of lethality, long-term disability in survivors, and the young age at which it typically strikes.
7. Epilepsy
Nearly 50 million people worldwide have epilepsy, making it one of the most common neurological diseases at any age. Epilepsy involves recurrent seizures caused by abnormal electrical activity in the brain. Seizures range from brief lapses in awareness to full-body convulsions, and their unpredictability affects every aspect of daily life: driving, employment, swimming, even being alone.
The condition is highly treatable. Affordable medications control seizures in up to 70% of cases. Yet three-quarters of people with epilepsy in low-income countries don’t receive any treatment at all. This treatment gap, driven by cost, stigma, and lack of trained providers, is the main reason epilepsy remains such a significant global burden.
8. Neurological Complications From Preterm Birth
Babies born prematurely, especially before 32 weeks, face a high risk of brain injury. The developing brain is fragile, and complications like bleeding within the brain or damage from inadequate oxygen can lead to cerebral palsy, learning disabilities, vision and hearing problems, and behavioral challenges. The earlier the birth, the greater the risk. Because these complications often result in lifelong disability beginning in infancy, the total years of life affected are enormous, which is why preterm birth complications rank so prominently on global neurological burden lists.
9. Autism Spectrum Disorder
Autism is a neurodevelopmental condition that affects how people communicate, interact socially, and process sensory information. It ranges widely in severity. Some autistic individuals live independently with minimal support, while others need substantial lifelong assistance. Autism appears on this list not because of mortality but because of its lifelong nature and the support needs it creates across education, employment, healthcare, and daily living. Diagnosis rates have increased significantly over the past two decades, partly due to broader diagnostic criteria and greater awareness.
10. Cancers of the Nervous System
Brain and spinal cord cancers round out the top 10. These tumors are relatively rare compared to other cancers, but they are disproportionately deadly and disabling. Brain tumors can cause seizures, personality changes, loss of motor function, speech difficulties, and cognitive decline depending on their location. Treatment often involves surgery, radiation, and chemotherapy, but outcomes vary enormously by tumor type. Some slow-growing tumors are manageable for years, while aggressive forms like glioblastoma have a median survival of about 15 months even with treatment.
Notable Conditions Outside the Top 10
Two well-known neurological diseases, Parkinson’s and multiple sclerosis, don’t appear in the top 10 by combined death and disability, but they represent major and growing concerns.
Parkinson’s disease is projected to affect 25.2 million people worldwide by 2050, a 112% increase from 2021. Population aging accounts for about 89% of that growth. Environmental factors are also contributing: pesticide exposure and air pollution are both linked to higher Parkinson’s risk, and rising rates of type 2 diabetes appear to accelerate the disease’s progression. Parkinson’s causes progressive loss of movement control, including tremors, stiffness, slowness, and balance problems, along with non-motor symptoms like sleep disturbances, depression, and cognitive decline.
Multiple sclerosis affects roughly 52,000 new people each year globally and is far more common in northern latitudes. Sweden has the highest national incidence at about 10 per 100,000 people, while high-income North America and Western Europe also see elevated rates. People of Northern European descent and white ethnic groups carry the highest risk. MS occurs when the immune system attacks the protective coating around nerve fibers, disrupting communication between the brain and body. Symptoms vary widely but commonly include fatigue, vision problems, numbness, difficulty walking, and cognitive changes.
Why These Rankings Matter
Less than one in three countries has a national policy addressing neurological care, according to the WHO. That gap is striking given that neurological conditions collectively cause more disability than heart disease or cancer. Many of the top 10 conditions are preventable, treatable, or both. Stroke risk drops dramatically with blood pressure control. Epilepsy responds to inexpensive medication. Meningitis has effective vaccines. Diabetic neuropathy slows with proper blood sugar management. The challenge isn’t knowledge. It’s access, funding, and prioritization.