Yes, COVID-19 commonly causes a range of unusual head sensations, from a hazy, foggy feeling to pressure, dizziness, and even a sense of detachment from your surroundings. Nearly half of all COVID patients experience headaches during the acute phase of illness, and more than 60% of those who develop long COVID report persistent cognitive symptoms like brain fog, even two or three years after infection.
If your head feels “off” during or after COVID, you’re experiencing something well-documented and surprisingly common. Here’s what’s behind it and what to expect.
What “Weird” Actually Feels Like
People describe the sensation in many ways, but a few patterns come up repeatedly: a general haziness in thought processes, a sense of cloudiness lowered across your thinking, difficulty focusing, slowness of thought, and forgetfulness. It’s not quite a headache, not quite dizziness, and not quite confusion. It’s more like everything in your mind becomes murky and indistinct, as though you’re trying to think through fog.
Some people also report feeling physically detached. About one in four COVID patients with persistent headaches experience derealization or depersonalization, a sensation where the world around you or your own body feels unreal or distant. Time distortion, where minutes stretch or compress unpredictably, is even more common, affecting roughly a third of these patients. These perceptual shifts can be unsettling, but they are a recognized neurological effect of the virus, not a sign you’re losing your mind.
COVID Headaches Feel Different
Headache shows up in about 47% of people during acute COVID infection. It tends to hit early: 39 to 55% of patients develop it on the first day of illness, and for up to 29% of people, headache is the very first symptom, sometimes the only one. The pain is usually on both sides of the head, moderate to severe, and feels similar to a tension headache or migraine.
What’s notable is that most people say this headache doesn’t feel like their usual headaches. Between 47 and 80% of patients describe the pattern as distinctly different from anything they’ve experienced before. Some notice it worsens with coughing. In a smaller number of cases, the headache becomes persistent, settling into a daily pattern that lasts three months or longer.
Why the Virus Affects Your Brain
Your brain is normally protected by a tight barrier (the blood-brain barrier) that keeps harmful substances in your bloodstream from reaching brain tissue. SARS-CoV-2 can compromise this barrier. Proteins on the virus’s surface bind to blood vessel cells in the brain, cross that protective layer, and trigger inflammatory responses on the other side.
Once inside, the virus primarily infects a type of brain cell called an astrocyte, which normally manages the flow of water, nutrients, and chemical signals between neurons. Infected astrocytes ramp up inflammation and reduce their ability to supply surrounding neurons with what they need. This creates a hostile environment where even uninfected neurons start to malfunction and die. Brain immune cells also become activated, releasing a cascade of inflammatory molecules that further disrupt normal signaling.
Researchers have found that infected astrocytes show imbalances in key metabolic molecules and neurotransmitters, the chemicals neurons use to communicate. This disruption correlates with the memory loss, confusion, and cognitive impairment people experience. There’s also evidence that COVID triggers tiny blood clots (microclots) from overactive platelets, which can reduce oxygen delivery to brain tissue and contribute to that foggy, sluggish feeling.
Dizziness and Autonomic Dysfunction
For some people, the weirdness is less about thinking and more about balance. Lightheadedness, a sensation of the room tilting, or feeling faint when you stand up are all common post-COVID complaints. These symptoms often point to autonomic dysfunction, where the part of your nervous system that controls automatic functions like heart rate and blood pressure stops working properly.
The most recognized form is postural orthostatic tachycardia syndrome (POTS), where your heart rate jumps excessively when you stand and your brain doesn’t get enough blood flow in the upright position. POTS causes palpitations, dizziness, headache, fatigue, and blurry vision. Before COVID existed, about half of POTS patients reported that an infection triggered their symptoms. Since the pandemic, POTS has become one of the more prevalent features of long COVID. It typically affects younger adults, particularly women.
Other patterns include blood pressure drops upon standing (orthostatic hypotension) and an inappropriately fast resting heart rate. In one study of 24 long COVID patients, 23 demonstrated measurable problems with upright posture during formal testing. If you feel worse when standing and better when lying down, autonomic dysfunction is a likely explanation.
How Long These Symptoms Last
During acute COVID, head-related symptoms like headache and fogginess typically begin resolving within a few weeks. But for a significant portion of people, they linger. One year after COVID diagnosis, 59% of patients in a prospective study still reported at least one neurological symptom. At that point, 25% still had concentration difficulties, 25% had forgetfulness, 16% had headaches, and 12% had dizziness or vertigo.
A larger study from Northwestern Medicine found that more than 60% of long COVID patients had neurological symptoms affecting their cognitive function and quality of life two and three years after infection. Brain fog affected 60% of those patients, fatigue 74%, and numbness or tingling 41%. Long COVID is formally defined as symptoms persisting beyond three months that can’t be explained by another diagnosis.
Not everyone follows this timeline. Many people recover fully within weeks to months. But the data makes clear that for a substantial minority, these head sensations are not brief. Recovery tends to be gradual rather than sudden, with good weeks and bad weeks.
What Helps
There’s no single treatment that resolves post-COVID brain fog or head weirdness, but the approach generally starts with ruling out other causes. Thyroid problems, sleep disorders, depression, autoimmune conditions, and medication side effects can all mimic or worsen these symptoms. A thorough evaluation, including a neurological exam and sometimes cognitive testing, helps identify what’s driving the problem.
For brain fog specifically, cognitive rehabilitation with a specialist who focuses on attention and concentration can make a measurable difference. Pacing your mental activity, breaking tasks into smaller chunks, and protecting your sleep are practical strategies that many patients find helpful. Physical activity, when tolerated, supports brain recovery, though people with POTS or exercise intolerance may need to start very gradually and in reclined positions like swimming or recumbent cycling.
For autonomic symptoms like dizziness on standing, increasing fluid and salt intake, wearing compression garments, and avoiding prolonged standing can reduce episodes. Formal tilt-table testing can confirm a POTS diagnosis and guide more targeted management.
Symptoms That Need Urgent Attention
Most post-COVID head symptoms are uncomfortable but not dangerous. However, certain changes warrant prompt medical evaluation. Sudden or progressive weakness in your arms or legs, new vision changes like double vision or loss of visual field, sudden sensory changes like numbness spreading through one side of your body, and acute psychiatric symptoms like hallucinations or severely reduced awareness are all red flags. These can indicate stroke, spinal cord involvement, or other serious neurological complications that require emergency assessment. If your symptoms are stable but persistent, that’s worth a medical visit too, just not necessarily the emergency room.