What are the neurological symptoms of long COVID?

Brain fog and slowed thinking, fatigue that crashes after exertion, new headaches, dizziness or a racing heart on standing, unrefreshing sleep, burning or tingling in the hands and feet, changes in smell or taste, and mood changes. Most people have a few of these rather than all of them, and each points to a specific driver that can be tested for.

How long do neurological symptoms typically last?

It varies widely. Many people improve over a few months. Others have symptoms for a year or more, and a smaller group develops a persistent illness that resembles ME/CFS. Symptoms still present three months after the infection are the usual threshold for calling it long COVID, and that is a reasonable point to be evaluated.

Can neurological symptoms occur even after a mild case of COVID-19?

Yes. Neurological long COVID follows mild and even asymptomatic infections, not just hospitalizations. Most of the long COVID patients we see were never in a hospital.

Should I see a neurologist for long COVID?

If brain fog, headaches, dizziness on standing, numbness or tingling, or sleep problems are the main symptoms, yes. A neurologist can test for the specific conditions behind them, such as migraine, POTS, small fiber neuropathy, and sleep apnea, each of which has its own treatment. Breathing or heart symptoms belong with a pulmonologist or cardiologist.

Are there any promising new treatments on the horizon?

Research is active. Areas under study include antiviral drugs for persistent virus, immune-modulating treatments, therapies aimed at microclots, and approaches to mitochondrial energy production. None has yet proven effective in a large trial, so we do not prescribe them outside of research, and it is reasonable to be cautious about paying for them anywhere until that evidence exists.

Can vaccination help if I already have long COVID?

Possibly. Some studies, including a large UK study published in The BMJ in 2022, found that people vaccinated after infection were less likely to report long COVID symptoms. Other studies found little effect. Vaccination is still recommended to reduce the risk of reinfection, which can set recovery back.

How should I prepare for the appointment?

Keep a symptom diary for a week or two, noting what triggers flares. Bring a list of all medications and supplements and any test results since your infection. Be ready to describe the COVID-19 illness itself, including when it was and how severe, and bring someone who watched you go through it if you can.

Long COVID and the Brain: Neurological Symptoms & Treatment

Long COVID and the Brain: Neurological Symptoms, Causes, and Treatment

Medically reviewed by Dr. Achillefs Ntranos, MDPublished September 15, 2024Updated September 3, 2026

Long COVID, also called post-acute sequelae of SARS-CoV-2 infection (PASC), affects many body systems, but the effects on the brain and nervous system are usually the ones that stop people working and living normally. The good news buried in a frustrating illness is that several of its symptoms turn out to have specific, treatable causes once someone looks for them.

What it is and how it affects the brain

Long COVID is a set of symptoms that persist for months after the initial illness, usually defined as symptoms still present three months on. Two systems are commonly involved: the central nervous system, which produces the cognitive symptoms and headaches, and the autonomic nervous system, which regulates heart rate, blood pressure, digestion, and temperature, and produces the dizziness and palpitations. Brain fog is the complaint we hear most often.

The neurological symptoms of long COVID, and what sits behind them

The list below is long because the label covers several different problems. The useful thing is that each symptom pattern points to a likely driver, and most of those drivers can be tested for and treated.

Symptom	What is often driving it	What can be done
Brain fog, poor concentration, word-finding trouble	Slowed processing and attention rather than true memory loss	Cognitive rehabilitation, treating sleep and mood, pacing
Fatigue that crashes a day or two after exertion	Post-exertional malaise, the same pattern as in ME/CFS	Pacing, explained in full on our ME/CFS page
Racing heart, lightheadedness on standing	Dysautonomia, often POTS	Fluids, salt, compression, medication when needed
Headaches, often new or unlike previous ones	A migraine pattern triggered by the infection	Migraine-directed treatment, which usually works
Burning, tingling, or numbness in hands and feet	Small fiber neuropathy triggered by the infection	Confirmed by skin biopsy, then treated
Unrefreshing sleep, insomnia	Disrupted sleep architecture, or sleep apnea unmasked by the illness	Home sleep study, then treatment
Changes in smell or taste, mood changes	Involvement of smell pathways, and the strain of a long illness	Smell training, and support for mood

Symptoms vary a great deal between people. Some have one dominant problem, others several at once, and the mix usually shifts over the months. When fatigue with a delayed crash is the main symptom, the illness may meet the criteria for ME/CFS, and that page covers post-exertional malaise and pacing in the detail they deserve.

Brain, heart, and branching nerve illustrations beside a pillow and blank notebook. — A neurological evaluation looks for the causes and treatable pieces of ongoing symptoms.

What is going on underneath

The mechanisms are still being worked out, and more than one is probably at work in any one patient. The main candidates are persistent viral material continuing to provoke the immune system, neuroinflammation that carries on after the infection has cleared, autoimmunity in which antibodies made during the infection react against nerve or brain tissue, damage to the lining of small blood vessels affecting blood flow, and impaired energy production in cells, which would fit the exercise intolerance.

None of these has a treatment proven in a large trial yet. That matters for your safety as much as your wallet: treatments aimed at these mechanisms, whether antivirals, immune therapies, procedures, or supplement protocols, are still experimental, and a treatment offered outside a research study with a promise attached deserves the question of what evidence supports it. We are glad to look at anything you have been offered.

How it is evaluated

There is no test for long COVID itself. The diagnosis rests on the history, an infection followed by persistent symptoms, and the testing exists to find the treatable pieces and exclude the look-alikes.

Test	What it answers
Blood work	Thyroid disease, anemia, vitamin deficiency, inflammation
Neurological examination and cognitive screening	Which functions are objectively affected
Heart rate and blood pressure lying and standing	Whether dysautonomia explains the standing symptoms
Home sleep study	Whether sleep apnea is behind the unrefreshing sleep
Skin biopsy	Whether small fiber neuropathy explains burning or numbness
Brain MRI, neuropsychological testing	Added when the examination or the cognitive symptoms call for it

Normal results do not mean the symptoms are imagined. A normal MRI rules out stroke, multiple sclerosis, and a tumor, which is worth knowing. It says nothing about small fiber neuropathy, dysautonomia, or sleep apnea, which need their own tests. Normal results narrow the plan rather than end it.

Some symptoms after COVID are emergencies

Sudden weakness or numbness on one side, trouble speaking, a sudden severe headache, chest pain, or a first seizure are emergencies, and the risk of stroke and clots is higher in the weeks after COVID-19. Call 911 or go to the nearest emergency department.

Symptom notebook, reflex hammer, blood pressure cuff, and nerve illustration. — There is no single neurological long COVID test. The workup follows the symptoms.

When to see a long COVID neurologist

Consider a neurologist if symptoms persist more than a few weeks past the infection, are interfering with work or daily life, or are getting worse rather than better. What a neurologist adds to a primary care visit or a general post-COVID clinic is the sorting: deciding which of your symptoms is migraine, which is POTS, which is neuropathy, and which is sleep, and then testing for and treating each one rather than managing "long COVID" as a single thing.

A first visit with Dr. Achillefs Ntranos, MD, a board-certified neurologist with fellowship training in multiple sclerosis and postdoctoral research in neuroimmunology, is 60 minutes. That is enough to go through the infection, everything since, and a full examination. Testing is then targeted rather than routine, and our articles on what to expect from the skin biopsy and how accurate it is explain the test we order most often here.

These visits work well by video, because the history carries most of the diagnosis, so you can request a visit in Beverly Hills or Los Angeles, or by video anywhere in California. Recovery is usually gradual and the plan is revised at follow-up rather than set once. Avoiding reinfection matters, because it is the most common cause of a setback we see.