Pica: Understanding the Compulsion to Eat Non-Food Items
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Pica is a complex eating disorder characterized by the compulsive consumption of non-food items that lack nutritional value, such as clay, ice, or paper. [1] While often observed in young children and pregnant women, it can also affect individuals with developmental or mental health conditions. [1] The primary risks involve toxic ingestion, intestinal blockages, and nutritional deficiencies. Fortunately, pica is highly treatable through a combination of behavioral therapy, nutritional supplementation, and environmental management.
Quick Answer
Pica is a mental health condition in which a person persistently eats non-food substances, such as dirt, hair or chalk, for at least one month. [1] It is often linked to iron or zinc deficiency, stress or developmental factors. [1] [2] Diagnosis involves clinical evaluation to rule out cultural practices or normal infant behavior. [1] Treatment addresses nutritional gaps and uses behavioral therapy.
What the research says
Pica is linked to anemia and low zinc. A meta-analysis of 43 studies (6,407 people with pica and 10,277 controls) found that pica was associated with 2.35 times greater odds of anemia (95% CI 1.94 to 2.85), lower hemoglobin (−0.65 g/dl), and lower plasma zinc (−34.3 µg/dl). The authors note that the direction of the causal relationship is unknown (Miao et al., Am J Hum Biol, 2015) [2].
Pica is common during pregnancy and the postpartum period. A meta-analysis of 70 studies produced an aggregate prevalence estimate of 27.8% (95% CI 22.8 to 33.3), with substantial variation between studies. Prevalence was higher in Africa and rose as the prevalence of anemia rose (Fawcett et al., Int J Gynaecol Obstet, 2016) [3].
Soil and ice are the most commonly reported items, and teeth can be affected. A systematic review of 89 studies found geophagia (soil or dirt) in 44.9% of papers and pagophagia (ice) in 22.5%. About 81% of papers reported pica alongside anemia, and tooth abrasion and dental caries were observed among people with pica. Nearly half of the included studies were case reports (Abu et al., BMC Oral Health, 2025) [4].
Research summaries are based on article abstracts retrieved from PubMed.
What is Pica?
Pica is a recognized eating disorder where a person experiences an uncontrollable urge to eat things that have no nutritional purpose. [1] The name is derived from Pica pica, the Latin name for the Eurasian magpie, a bird traditionally known for its habit of picking up and eating unusual objects. [1] While the behavior can be harmless in some cases—such as eating ice during pregnancy—it can become life-threatening if the ingested items are toxic or cause physical damage to the digestive system. [1]
This condition is often misunderstood and can carry a significant social stigma, leading many individuals to feel ashamed or embarrassed. [1] Because it is a compulsive behavior, those affected often find it nearly impossible to stop without professional intervention. Pica is most frequently diagnosed in young children under the age of six, pregnant women, and individuals with mental health conditions like autism spectrum disorder or schizophrenia. [1]
What items do people with pica eat, and what are the health risks?
The substances ingested by people with pica vary widely, but most individuals tend to prefer a single type of non-food item. [1] The health risks associated with pica depend entirely on what is being consumed. For instance, eating hair (trichophagia) can lead to severe intestinal blockages, while eating soil (geophagia) may introduce parasites into the body. [1]
Substance Category | Common Examples | Potential Health Risks |
Natural Elements | Clay, dirt, soil, pebbles, charcoal. [1] | Parasitic infections, lead poisoning, intestinal tears. |
Household Items | Paper, chalk, soap, laundry starch, ash. [1] | Chemical toxicity, digestive distress, electrolyte imbalance. |
Biological Items | Hair, string, wool, eggshells, feces. [1] | Intestinal blockages (bezoars), bacterial infections. [1] |
Other Items | Ice, coffee grounds, paint chips. [1] |
Beyond the immediate danger of the items themselves, pica is often a sign of underlying health issues. Many people with pica suffer from severe nutritional deficiencies, particularly low levels of iron (anemia), zinc, or calcium. [1] [2] These deficiencies can lead to further complications like irregular heart rhythms or chronic constipation.
What causes pica, and how is it diagnosed?
Experts believe that pica is driven by a combination of biological, psychological, and environmental factors. In many cases, the body triggers these unusual cravings as a misguided attempt to signal a lack of essential minerals. For others, the behavior may be a coping mechanism for extreme stress, anxiety, or neglect during childhood. [1]
Clinical Diagnosis
To be formally diagnosed with pica, a healthcare provider looks for four specific criteria:
Duration: The behavior must persist for at least one month. [1]
Developmental Level: The person must be at an age where they should mentally understand that the substance is not food. [1]
Cultural Context: The behavior cannot be part of a socially or culturally accepted practice. [1]
Severity: If the behavior occurs alongside another mental health condition, it must be severe enough to require independent clinical attention. [1]
How is pica managed and treated?
The treatment for pica is multi-faceted and tailored to the individual’s specific needs. For pregnant women and young children, the condition often resolves on its own as the body’s needs change or as the child learns to distinguish between food and non-food items. [1] For others, a more structured approach is necessary to ensure safety and long-term recovery.
Treatment Strategies
Nutritional Support: The first step often involves blood tests to identify mineral deficiencies. Supplementing iron, zinc, or calcium can frequently eliminate the cravings entirely.
Behavioral Therapy: This is the primary treatment for pica. [1] Therapists work with patients to replace the compulsive urge with healthier behaviors and to manage the underlying stress or anxiety that may be driving the condition.
Environmental Management: For children or those with intellectual disabilities, close supervision and the removal of dangerous non-food items from their environment are essential for preventing injury. [1]
Medical Intervention: If a blockage or poisoning has occurred, immediate medical or surgical treatment is required to address the physical damage.
Conclusion
Pica is a challenging condition that requires a compassionate and comprehensive medical approach. By identifying the underlying nutritional or psychological triggers, healthcare providers can help individuals break the cycle of compulsive eating. Early intervention is particularly important for children and pregnant women to prevent long-term health complications. With proper therapy and support, most people with pica can achieve a full recovery and return to a healthy, balanced diet.
Frequently Asked Questions
Is pica just a “weird habit”?
No. Pica is a recognized medical and mental health condition. [1] It is often a sign of a nutritional deficiency or an underlying psychological issue that requires professional care.
Why do pregnant women eat ice?
Craving ice (pagophagia) is a very common form of pica during pregnancy and is often linked to iron deficiency anemia. [1] [4] It usually disappears after the baby is born. [1]
Is it safe to eat “clean” dirt?
No. Even soil that looks clean can contain parasites, bacteria, and toxic heavy metals like lead, which can cause serious illness or organ damage.
How can I tell if my child has pica?
If your child is over the age of two and persistently eats non-food items for more than a month, you should consult a pediatrician for an evaluation.
Can pica be a sign of autism?
Pica is more common among individuals with autism spectrum disorder and other intellectual disabilities [1], where it may serve as a sensory-seeking behavior.
What is the most dangerous thing someone with pica can eat?
Paint chips (due to lead poisoning) and sharp objects or hair (which cause intestinal blockages) are among the most hazardous items. [1]
Does pica go away on its own?
In many children and pregnant women, it does. [1] However, if it is linked to a chronic mental health condition or a severe deficiency, it requires active treatment.
What should I do if someone swallows something dangerous?
Seek emergency medical attention immediately. Do not wait for symptoms to appear, as internal damage or poisoning can be silent at first.
Are there medications for pica?
There are no specific medications to “cure” pica, but doctors may prescribe supplements for deficiencies or medications to manage co-existing anxiety or OCD.
What tests are done when someone has pica?
Providers often check blood for anemia and low iron, and may test zinc or lead levels depending on what was eaten. Imaging may be needed if a blockage is suspected.
Related Reading
Iron Deficiency Anemia: Symptoms, Causes, Treatment & Complete Guide explains low iron, a common cause of pica cravings.
Lead Poisoning: What Parents and Adults Need to Know explains the risk of eating paint chips or soil with lead.
Rapunzel Syndrome Explained: Understanding Trichobezoars and Hair Eating explains hair balls that can block the gut after eating hair.
Zinc Deficiency: A Comprehensive Guide to Symptoms, Causes, and Treatment explains low zinc levels, which are linked to pica.
References
Cleveland Clinic. Pica. Cleveland Clinic Health Library. Last updated May 6, 2022. https://my.clevelandclinic.org/health/diseases/22944-pica
Miao D, Young SL, Golden CD. A meta-analysis of pica and micronutrient status. Am J Hum Biol. 2015;27(1):84-93. PMID: 25156147. https://doi.org/10.1002/ajhb.22598
Fawcett EJ, Fawcett JM, Mazmanian D. A meta-analysis of the worldwide prevalence of pica during pregnancy and the postpartum period. Int J Gynaecol Obstet. 2016;133(3):277-283. PMID: 26892693. https://doi.org/10.1016/j.ijgo.2015.10.012
Abu BAZ, Morrissey A, Wu Y, et al. Pica practices, anemia, and oral health outcomes: a systematic review. BMC Oral Health. 2025;25(1):13. PMID: 39754099. https://doi.org/10.1186/s12903-024-05371-7
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have about a medical condition.
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