Todd’s syndrome is a neurological condition that distorts how your brain processes size, distance, and the shape of your own body. You might suddenly perceive your hands as enormous, a room as impossibly small, or objects drifting further away than they actually are. The condition is more commonly known as Alice in Wonderland syndrome (AIWS), named after Lewis Carroll’s famous character who grows and shrinks throughout her adventure. English psychiatrist John Todd first described it in 1955 after documenting six patients who experienced these bizarre perceptual episodes.
What the Distortions Feel Like
The hallmark of Todd’s syndrome is that your perception warps while your eyes work perfectly fine. The problem isn’t with vision itself but with how the brain interprets what the eyes see. These distortions fall into distinct patterns. Micropsia makes objects or people appear smaller than they are, while macropsia makes them look abnormally large. Pelopsia brings things visually closer, and teleopsia pushes them further away. When micropsia and teleopsia strike at the same time for the same object, the effect is sometimes called “Lilliputianism,” where people around you look like miniature figures.
Body image distortions are just as common as visual ones. In Todd’s original 1955 report, every patient experienced distortions of their own body, perceiving changes in the size, mass, or shape of body parts, or feeling their body shift position in space. Some people feel as though they’ve been split vertically down the middle into two halves. Others describe their head swelling or their limbs stretching. These episodes can also come with a feeling of detachment from reality or from your own self, as though you’re watching everything from a distance. Some people report that time seems to speed up or slow down during an episode.
Episodes are typically brief, lasting minutes rather than hours, though they can recur. The distortions are fully reversible, and people remain aware that what they’re experiencing isn’t real, which distinguishes Todd’s syndrome from psychotic hallucinations.
Who Gets It
Todd’s syndrome is often described as a childhood condition. A systematic review of 170 reported cases found that 78% were in people under 18, with an average age of about 15.5 years. Children’s developing brains may be more vulnerable to the kinds of temporary disruptions that trigger these episodes. But the condition is far from exclusive to kids.
Among adults, Todd’s syndrome shows up most often alongside migraine. A 2024 study of 808 migraine patients at a headache center found that 16.5% had experienced at least one core symptom of the syndrome at some point in their lives. Those with migraine with aura were especially likely to report episodes, with about half of the affected group falling into that category. Broader surveys of the general population suggest the individual distortions are surprisingly common: one study of nearly 300 adults found that 30% had experienced teleopsia (objects appearing far away), 15% had experienced macropsia, and 14% micropsia at some point in their lives. Many of these people likely never received a formal diagnosis or even recognized what was happening.
Common Causes and Triggers
In adults, migraine is the most frequently identified trigger. The perceptual distortions can occur before, during, or after a migraine headache, and in some cases they happen without any headache at all.
In children, infections are emerging as the leading cause. Epstein-Barr virus (the virus behind mono) is one of the most commonly implicated triggers in pediatric cases. Other viruses linked to episodes include influenza A and B, cytomegalovirus, and human herpesvirus 6. The mechanism likely involves the virus triggering temporary inflammation in the brain or an immune response that briefly disrupts neural circuits, without causing any lasting structural damage. In most post-viral cases, the episodes resolve on their own as the infection clears.
Epilepsy accounts for a smaller but notable share of cases. Seizure activity in certain brain regions can produce the same kinds of size and distance distortions. Less commonly, Todd’s syndrome has been associated with brain lesions, psychiatric conditions, and certain medications.
What Happens in the Brain
Todd’s syndrome doesn’t result from a problem with the eyes. It stems from temporary dysfunction in the brain areas responsible for integrating sensory information, particularly the regions that stitch together what you see with your sense of where your body is in space. In post-viral cases, proposed mechanisms include inflammation triggered by immune signaling molecules, brief autoimmune cross-reactivity, and direct viral effects on brain cells. Epstein-Barr virus can infect immune cells and potentially reach the central nervous system, causing a reversible disruption of the neural circuits that handle perception.
In migraine-related cases, the distortions may be linked to cortical spreading depression, a wave of altered electrical activity that moves across the brain’s surface and temporarily changes how neurons fire. This is the same phenomenon thought to produce migraine aura. The key point across all causes is that the disruption is functional, not structural. Brain scans typically look normal, because the circuits themselves are intact; they’re just misfiring temporarily.
How It’s Diagnosed
There’s no blood test or brain scan that confirms Todd’s syndrome. Diagnosis is clinical, meaning it’s based on your description of the episodes and the exclusion of other conditions. Doctors will typically order brain imaging (usually an MRI) and sometimes an EEG to rule out structural problems like tumors, seizure disorders, or stroke. Blood tests may be used to check for active infections, particularly Epstein-Barr virus in children presenting with sudden perceptual distortions during or after an illness.
Because the episodes are intermittent and often short, many people struggle to describe what’s happening, or worry they won’t be taken seriously. Children especially may have difficulty articulating that a room looks wrong or that their body feels distorted. If a child suddenly says their hands look huge or that you look very far away, particularly during or shortly after a viral illness, Todd’s syndrome is worth considering.
Treatment and Outlook
There is no specific medication for Todd’s syndrome itself. Treatment targets the underlying cause. If migraine is the trigger, managing migraines through standard preventive strategies can reduce the frequency of perceptual episodes. If an infection triggered the episodes, treatment focuses on the infection, and the distortions typically resolve as the body recovers.
The long-term outlook is generally reassuring. In children with infection-triggered episodes, the syndrome often resolves completely and never returns. In adults with migraine-associated Todd’s syndrome, episodes may recur but tend to become less frequent over time. The distortions, while deeply unsettling in the moment, don’t cause brain damage and don’t progress into more serious neurological disease. Understanding what the episodes are, and that they’re temporary, is often the most valuable part of a diagnosis.