Neurology is the branch of medicine focused on diagnosing and treating disorders of the nervous system, which includes the brain, spinal cord, and nerves. It’s one of the largest areas of medicine by sheer number of people affected: more than 3 billion people worldwide were living with a neurological condition in 2021, making these disorders the leading cause of illness and disability globally.
Your nervous system is essentially your body’s command center. It controls everything from moving your arm to beating your heart to forming a thought. When something goes wrong anywhere in that network, a neurologist is the specialist trained to figure out what’s happening and how to treat it.
What Neurologists Diagnose and Treat
The National Institute of Neurological Disorders and Stroke catalogs hundreds of recognized neurological conditions. Some are extremely common, others rare. The conditions most people encounter include:
- Headache and migraine disorders
- Epilepsy and seizures
- Stroke
- Alzheimer’s disease and other dementias
- Parkinson’s disease
- Multiple sclerosis (MS)
- Peripheral neuropathy (nerve damage in the hands and feet)
- ALS (amyotrophic lateral sclerosis)
- Brain and spinal cord tumors
- Sleep disorders like narcolepsy
The field also covers conditions you might not immediately associate with the nervous system, such as myasthenia gravis (a disorder where muscles weaken because nerve signals aren’t reaching them properly), Guillain-Barré syndrome (where the immune system attacks the nerves), and even certain chronic pain syndromes. Movement disorders, balance problems, memory loss, and unexplained numbness or tingling all fall under neurology’s umbrella.
What Happens During a Neurological Exam
A visit to a neurologist typically starts with a physical exam that tests how well your nervous system is working. This isn’t like a standard checkup. The neurologist is systematically checking specific pathways and functions.
The exam usually covers several areas. Mental status is assessed through conversation: whether you’re oriented to who you are, where you are, and the date, and whether your speech is clear and coherent. Motor function is tested by having you push and pull against the doctor’s hands with your arms and legs. Balance might be checked by watching you walk in a straight line or stand with your eyes closed while being gently nudged. Coordination tests include things like tapping your fingers rapidly or touching your nose with your eyes closed.
Cranial nerves get individual attention. You might be asked to identify smells, follow a light with your eyes, or stick out your tongue. Sensory testing checks whether you can distinguish sharp from dull, hot from cold, using instruments like dull needles, tuning forks, or alcohol swabs on different parts of your body. Reflexes are checked with the familiar reflex hammer.
All of this tells the neurologist which parts of the nervous system are and aren’t working normally, which helps narrow down what might be causing your symptoms.
Diagnostic Tools Beyond the Physical Exam
When the physical exam points toward a specific problem, neurologists have several imaging and monitoring tools to look deeper.
An MRI uses powerful magnets and radio waves to create detailed images of the brain and spinal cord. It can reveal strokes, tumors, inflammation, infections, scarring, and signs of neurodegenerative diseases. It’s one of the most commonly ordered tests in neurology because it shows soft tissue in extraordinary detail without radiation.
An EEG (electroencephalogram) monitors the brain’s electrical activity through sensors placed on the scalp. It’s the primary tool for diagnosing seizure disorders and is also used to evaluate sleep disorders or monitor brain activity during anesthesia or after loss of consciousness.
An EMG (electromyography) records electrical activity in muscles and helps diagnose nerve and muscle disorders, spinal nerve compression, and motor neuron diseases like ALS. If you’re experiencing weakness, numbness, or muscle twitching, this test can help pinpoint whether the problem is in the nerve, the muscle, or the connection between them.
A lumbar puncture, sometimes called a spinal tap, involves removing a small amount of the fluid surrounding the brain and spinal cord. Testing this fluid can reveal bleeding, infection, multiple sclerosis, or metabolic diseases. It’s done as an outpatient procedure in many cases.
Neurology vs. Psychiatry
Both neurologists and psychiatrists deal with the brain, but they approach it differently. The split dates back to the 20th century, when neurologists gravitated toward brain disorders that come with visible physical signs, like the tremor of Parkinson’s or the weakness caused by a stroke. Psychiatrists focused on disorders of mood and thought, like depression, anxiety, and schizophrenia, where a standard neurological exam might look completely normal.
In practice, there’s significant overlap. A condition like epilepsy clearly belongs to neurology, but people with epilepsy often experience depression and anxiety. Alzheimer’s disease causes both the cognitive decline a neurologist treats and the behavioral changes a psychiatrist might manage. The boundary between the two fields is less rigid than it once was, and some specialists now work across both disciplines in a subspecialty called behavioral neurology and neuropsychiatry.
Neurology vs. Neurosurgery
Neurologists and neurosurgeons both treat nervous system disorders, but neurologists manage conditions primarily through non-surgical means: medications, rehabilitation, monitoring, and ongoing care. If a neurologist discovers a structural problem like a brain tumor or an aneurysm that requires an operation, they refer the patient to a neurosurgeon. Think of the neurologist as the detective who identifies the problem and the neurosurgeon as the one who operates when surgery is the answer. Many neurological conditions, however, never require surgery at all.
How Neurologists Are Trained
Becoming a neurologist requires a long educational path. After four years of college and four years of medical school, a neurologist completes a one-year internship in internal medicine followed by at least three years of specialized residency training in neurology. Child neurologists do two years of pediatrics instead of the internal medicine year. The entire process takes a minimum of 12 years after high school.
After residency, neurologists pass a board certification exam administered by the American Board of Psychiatry and Neurology. Many then pursue an additional one to two years of fellowship training in a subspecialty.
Neurology Subspecialties
Neurology is broad enough that many neurologists specialize further. There are currently 31 types of neurology subspecialty fellowships in the United States, with 17 of them formally accredited. Some of the most common include:
- Vascular neurology: focuses on stroke and blood vessel disorders of the brain
- Epilepsy: specializes in seizure disorders and their management
- Movement disorders: covers Parkinson’s disease, tremors, and dystonia
- Neuromuscular medicine: deals with diseases affecting the nerves and muscles
- Headache medicine: treats chronic migraines and other headache disorders
- Neuro-oncology: specializes in brain and spinal cord tumors
- Neurocritical care: manages life-threatening neurological emergencies in intensive care
- Sleep medicine: diagnoses and treats disorders like narcolepsy and sleep apnea
- Neuroimmunology: focuses on conditions like multiple sclerosis where the immune system attacks the nervous system
If you’re referred to a neurologist for a specific condition, you may end up seeing a subspecialist whose entire practice is focused on that one area. This level of specialization often means access to the most current treatment approaches for your particular condition.