Why do many people with sickle cell disease compulsively eat non-food items?

Health · Published 30 September 2026 Swipe more like this →

In short: Sickle cell disease is known for painful blood vessel blockages, but a hidden symptom is pica: the persistent craving for substances like dirt or paper. Recent research shows this behavior is surprisingly common among patients, suggesting that biological, social, and psychological factors may be more deeply intertwined than previously understood.

Sickle cell disease is a hereditary condition where red blood cells contain faulty hemoglobin. This defect causes cells to stiffen into a sickle shape when oxygen levels drop, preventing them from moving smoothly through small blood vessels. These rigid cells often clump together, obstructing circulation and triggering painful crises, organ damage, and chronic anemia. While the physical mechanics of these blockages are well-documented, researchers are increasingly looking at the broader, often overlooked, behavioral health of patients.

One such behavior is pica, defined as the regular consumption of non-nutritive materials for at least one month. A systematic review of ten studies involving 1,585 participants found that 34% of individuals with sickle cell disease experience pica. The substances most frequently consumed include clay or dirt, paper, and fabric. While the exact cause remains unclear, the data suggests that younger age, lower body weight, and lower hemoglobin levels are potential biological correlates. These findings highlight that the condition affects more than just blood flow; it impacts the patient's entire well-being.

The complexity of pica in this population extends into the social and psychological domains. Evidence indicates that lower socioeconomic status, higher impulsivity, and lower family satisfaction are linked to the behavior. Because current studies are limited by small sample sizes and a lack of standardized assessment tools, experts emphasize that more longitudinal research is required. By integrating neuroimaging with biological and social data, scientists hope to better understand why this condition manifests in such diverse ways, moving beyond the traditional focus on vaso-occlusive crises to a more holistic view of patient health.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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