Iron deficiency is associated with a meaningfully higher risk of seizures, particularly febrile seizures in young children. A meta-analysis pooling eight case-control studies found that iron-deficient children were roughly 80 percent more likely to experience acute seizures than iron-sufficient children. The relationship is not as simple as “low iron causes a seizure,” though. It involves changes in brain chemistry, the insulating sheaths around nerve fibers, and even cellular energy production, and the picture shifts depending on the person’s age, the type of seizure, and when the deficiency occurred.
The Strongest Evidence Comes from Febrile Seizures in Children
Febrile seizures, the convulsions that happen during a fever in young children, are where the research is most extensive. Multiple case-control studies have compared iron status in children who seize with a fever against children who have fevers but do not seize. A consistent pattern emerges: the children who convulse tend to have lower serum iron, lower ferritin (the body’s stored iron), and higher rates of iron deficiency anemia. One study found iron deficiency anemia in 45 percent of children with febrile convulsions compared to 22 percent of feverish children who did not convulse.1PubMed Central. The Relationship between Iron Deficiency and Febrile Convulsion: A Case-Control Study Another found that both febrile and non-febrile seizure groups had lower hemoglobin and serum iron than healthy controls, with iron deficiency present in about 44 to 48 percent of seizure patients versus 28 percent of controls.2PubMed Central. Iron Deficiency and Iron Deficiency Anemia in Children With First Attack of Seizure and on Healthy Control Group: A Comparative Study
These individual studies are suggestive, but the stronger evidence comes from pooled analyses. A systematic review and meta-analysis of studies on this question found that iron deficiency anemia was associated with about twice the odds of febrile seizures. When the researchers broke the data down by which lab marker was used to diagnose the anemia, low ferritin showed the strongest association, with nearly four times the odds.3PubMed. Relationship between iron deficiency anemia and febrile seizures in children: A systematic review and meta-analysis A separate, more recent meta-analysis confirmed the pattern and found that among several iron-related lab values, low ferritin was the single best predictor of febrile seizure risk.4PubMed. Anemia and Poor Iron Indices Are Associated With Susceptibility to Febrile Seizures in Children: A Systematic Review and Meta-analysis A large pooled analysis combining data from children in multiple countries, including those in resource-limited settings, found iron deficiency in about 30 percent of seizure cases versus 22 percent of controls, with an overall 79 percent increased risk.5PubMed Central. Iron Deficiency and Acute Seizures: Results from Children Living in Rural Kenya and a Meta-Analysis
One important nuance: the link seems to hold even when iron levels are low but not low enough to produce full-blown anemia. A European study found that children with febrile seizures had lower ferritin than feverish controls, and that iron deficiency itself, independent of anemia, was associated with seizure recurrence.6PubMed. Association between iron deficiency and febrile seizures This matters because many children with borderline iron stores would not be flagged as “anemic” on routine blood work, yet their brains may still be affected.
What Iron Does in the Brain
The brain is one of the most iron-hungry organs in the body, and understanding why helps explain the seizure connection. Iron plays several roles in neural function, and when supplies run short, problems stack up.
The most well-documented effect is on myelin, the fatty insulation that wraps nerve fibers and allows electrical signals to travel quickly and efficiently. The cells responsible for producing myelin in the brain, called oligodendrocytes, contain more iron than any other brain cell type. They need it as a cofactor for the enzymes that synthesize cholesterol and lipids, the main building blocks of the myelin sheath.7PubMed Central. Iron Metabolism in Oligodendrocytes and Astrocytes, Implications for Myelination and Remyelination Without adequate iron, these cells cannot produce myelin normally.8PubMed Central. What Does Iron Mean to an Oligodendrocyte? Poor myelination means nerve signals travel more slowly and less reliably, which can shift the brain’s excitability in ways that lower the threshold for a seizure.
Iron deficiency also disrupts the balance of neurotransmitters. Research has shown that iron-deficient brains have altered metabolism of monoamine neurotransmitters like dopamine and serotonin, and that the balance between glutamate, the brain’s main excitatory signal, and GABA, its main inhibitory signal, shifts when iron status changes.9PubMed Central. Iron and mechanisms of emotional behavior Since seizures are fundamentally a problem of excessive, synchronized electrical activity, anything that tips the glutamate-GABA balance toward more excitation and less inhibition could plausibly increase vulnerability.
At an even more basic level, iron-deficient neurons struggle to produce energy. Lab work on developing hippocampal neurons, cells from the brain region most involved in certain seizure types, has shown that iron deprivation cuts total cellular energy production by roughly a quarter and reduces the energy output of mitochondria, the cell’s power plants, by a similar margin.10bioRxiv. Iron Deficiency Impairs Mitochondrial Energetics and Early Axonal Growth and Branching in Developing Hippocampal Neurons Neurons that cannot keep up with their energy demands are less able to maintain the carefully controlled ion gradients that prevent inappropriate firing.
Timing Changes the Outcome
One of the more surprising findings in this area is that when iron deficiency occurs during development matters enormously, and not always in the direction you would expect. An animal study designed to tease apart gestational versus postnatal iron deficiency found strikingly different effects on seizure susceptibility. Mice that were iron-deficient after birth, during the period equivalent to infancy, had a lower seizure threshold and were more prone to certain seizure types. But mice that experienced iron deficiency only during gestation actually had a higher seizure threshold, meaning they were harder to provoke into a seizure, even though they still had mildly low iron.11PubMed Central. Iron Deficiency Affects Seizure Susceptibility in a Time- and Sex-Specific Manner
The researchers also found sex-specific differences, suggesting that the relationship between iron and seizures is not a one-size-fits-all equation. This is an animal model, so translating it directly to human clinical decisions requires caution. But it underscores an important point: the developing brain’s relationship with iron is complex, and the same deficiency at different developmental windows can have opposite neurological consequences. It also helps explain why clinical studies in humans sometimes produce conflicting results. Children enrolled in different studies may have experienced their iron deficiency at different ages and for different durations.
Can Iron Deficiency Trigger Seizures in Adults?
Most of the research centers on children, but iron deficiency is not limited to pediatric populations. In adults, the connection to seizures is less studied and tends to surface through indirect mechanisms rather than the direct brain-chemistry pathways seen in developing brains. One well-documented route is through blood clots in the brain’s venous drainage system. Severe iron deficiency anemia increases blood viscosity and alters clotting factors, which raises the risk of cerebral venous sinus thrombosis. Case reports describe adults with no other clotting risk factors who developed venous infarctions and seizures in the setting of severe iron deficiency anemia.12BMJ Journals. Rare presentation of iron deficiency anaemia with cerebral venous sinus thrombosis in a middle-aged woman These are uncommon events, but they illustrate that in extreme cases, the hematologic consequences of iron deficiency can create conditions in the brain favorable to seizures.
Adults with epilepsy face an additional complication. Some commonly prescribed anti-seizure medications can themselves contribute to anemia. Certain anti-epileptic drugs interfere with folate metabolism or directly affect red blood cell production, creating a feedback loop where the treatment for seizures contributes to a nutritional state that may worsen seizure control.13PubMed Central. Association of Anemia With Epilepsy and Antiepileptic Drugs If you are managing epilepsy and also have chronic fatigue or other symptoms of anemia, it is worth having your iron status checked specifically, because the medication itself might be part of the problem.
Does Treating Iron Deficiency Prevent Seizures?
This is the practical question every parent wants answered, and the honest answer is that the evidence is encouraging but not yet conclusive. A prospective study that gave iron supplements to children after a first febrile seizure found a trend toward fewer recurrences in the supplemented group. The absolute risk of having another seizure dropped by about 6 to 7 percentage points with supplementation. For children with complex febrile seizures, the effect was more pronounced, with an absolute risk reduction of about 15 percent. But in no analysis did the results reach statistical significance.14PubMed Central. Effectiveness of prophylactic iron supplementation in the reduction of recurrence of febrile seizures in children: A prospective study with comparison with historical controls
That does not mean iron supplementation is useless. The study estimated that roughly 14 to 16 children would need to receive iron supplementation to prevent one seizure recurrence. For the complex febrile seizure subgroup, that number dropped to about 6 or 7. Those are reasonable numbers for a safe, inexpensive intervention. The problem is that the studies so far have been too small to detect a modest benefit with confidence. Large, well-powered randomized trials are still needed. In the meantime, most pediatric guidelines already recommend screening for and correcting iron deficiency in children who have had febrile seizures, partly because of the seizure association and partly because iron deficiency in young children has plenty of other consequences for brain development and behavior.
The Reverse Problem: Seizures and Brain Iron Accumulation
The relationship between iron and seizures is not one-directional. Research has revealed that seizures themselves alter how the brain handles iron, potentially creating a vicious cycle. After prolonged seizures (status epilepticus), brain tissue shows elevated iron deposits, particularly in the hippocampus and surrounding areas. Studies using post-mortem tissue from people with temporal lobe epilepsy found abnormal iron accumulation inside neurons, along with changes in the genes responsible for managing iron storage.15PubMed Central. Seizure-mediated iron accumulation and dysregulated iron metabolism after status epilepticus and in temporal lobe epilepsy
This iron accumulation appears to happen because seizures damage blood vessels and disrupt the blood-brain barrier, allowing iron-containing blood products to leak into brain tissue where they do not belong. Free iron in brain tissue generates highly reactive molecules that damage cell membranes, mitochondria, and DNA. In animal models, the iron buildup persists long after the initial seizure, into the chronic epilepsy phase, suggesting it may contribute to the progression of the disease. This is a fundamentally different problem from dietary iron deficiency: here, the issue is not too little iron in the body, but too much iron in the wrong place in the brain, deposited there by the seizures themselves.
Breath-Holding Spells and the Iron Connection
Parents searching for information about iron and seizures often arrive at this topic through a different doorway: breath-holding spells. These dramatic episodes, in which a young child cries, holds their breath, turns blue or pale, and sometimes loses consciousness and stiffens or has jerking movements, can look terrifyingly like a seizure. They are among the most common causes of parents rushing to the emergency department convinced their child has had a convulsion.16PubMed Central. Diverse presentation of breath holding spells: two case reports with literature review
Breath-holding spells are not true epileptic seizures. They are a reflex response triggered by crying, pain, frustration, or a minor startle, and the brief loss of oxygen to the brain is what causes the stiffening and twitching. The connection to iron is that these spells are significantly more common in iron-deficient children, and multiple studies have shown that iron supplementation reduces their frequency. The mechanism likely involves iron’s role in the autonomic nervous system and in oxygen-carrying capacity. If your toddler is having breath-holding spells, a blood test for iron deficiency is one of the first things a pediatrician should order, because treatment is often straightforward and effective.
What Changes in Brain Electrical Activity Look Like
Beyond the clinical observation that iron-deficient people have more seizures, there is evidence that iron deficiency changes the brain’s baseline electrical patterns, even in the absence of obvious seizures. EEG studies in people with anemia have found that the power of electrical oscillations across several frequency bands is reduced, particularly in temporal, parietal, and occipital brain regions.17PubMed. Quantitative EEG and cognitive evoked potentials in anemia These changes suggest a broadly altered state of neural processing, not limited to seizure generation but reflecting widespread effects on how the brain communicates internally.
In infants, the effects show up during sleep. Iron-deficient anemic babies produce fewer sleep spindles, the brief bursts of electrical activity during non-REM sleep that are thought to play a role in memory consolidation and brain maturation. Their spindles also occur at lower frequencies and with longer gaps between them.18PubMed Central. Iron-Deficiency Anemia is Associated with Altered Characteristics of Sleep Spindles in NREM Sleep in Infancy These findings are a reminder that the brain effects of iron deficiency extend well beyond seizure risk into cognitive development and sleep architecture. They also help explain why iron-deficient children often show developmental delays and behavioral changes that persist even after iron levels are restored, since some of the structural changes to the brain, particularly poor myelination during critical developmental windows, may not be fully reversible.
Ferritin Versus Hemoglobin as a Warning Sign
One practical takeaway from this body of research is that the standard blood test most people associate with iron, hemoglobin, is not the best screening tool for seizure risk. Hemoglobin tells you whether someone has developed frank anemia, but by that point, iron stores have been depleted for a while. Ferritin, which reflects how much iron the body has in reserve, drops earlier in the course of iron depletion and appears to be a more sensitive predictor of febrile seizure risk. The meta-analysis that broke down associations by diagnostic marker found a far stronger link when low ferritin was used to define iron deficiency than when hemoglobin or serum iron alone was used.3PubMed. Relationship between iron deficiency anemia and febrile seizures in children: A systematic review and meta-analysis The European study of febrile seizure recurrence similarly pointed to ferritin rather than hemoglobin as the relevant marker.6PubMed. Association between iron deficiency and febrile seizures
Ferritin is an imperfect test because it rises in the setting of infection or inflammation, which can mask true iron deficiency. A child running a high fever may have a “normal” ferritin that is artificially elevated. Clinicians sometimes work around this by checking ferritin alongside inflammatory markers, or by also measuring transferrin saturation or soluble transferrin receptor levels. If you are trying to understand whether iron played a role in your child’s febrile seizure, a single hemoglobin value that comes back in the normal range does not rule it out. Asking specifically about ferritin and iron studies gives a more complete picture.
Who Is Most Vulnerable
Iron deficiency is the single most common nutritional deficiency worldwide, and certain groups face outsized risk. Toddlers between six months and three years are the classic high-risk population, partly because rapid growth drives up iron needs and partly because this is the age when febrile seizures are most common. Children who were born preterm, had low birth weight, or were exclusively breastfed past six months without iron-fortified complementary foods are at particular risk. In resource-limited settings, where dietary iron intake is often chronically low and infectious diseases further deplete iron stores, the convergence of high fever burden and high iron deficiency rates creates conditions where febrile seizures are especially common.5PubMed Central. Iron Deficiency and Acute Seizures: Results from Children Living in Rural Kenya and a Meta-Analysis
Women of reproductive age, people with heavy menstrual bleeding, vegetarians and vegans who do not supplement carefully, individuals with celiac disease or inflammatory bowel disease, and anyone who has undergone gastric surgery are also at elevated risk of iron deficiency. While the seizure connection has been studied most in children, the brain mechanisms involved, impaired myelination, disrupted neurotransmitter balance, reduced cellular energy, apply across the lifespan. The adult brain is less vulnerable than the rapidly developing infant brain, but it is not immune. For adults with epilepsy, ensuring adequate iron status is a basic step worth taking, particularly given the potential for anti-epileptic medications to contribute to anemia.