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These are the case findings in their original reveal order, moving from the broader presentation to the most discriminating evidence.
Clue 1
A 27-year-old, 22 weeks into her first pregnancy, is referred by her midwife. She is exhausted in a way she cannot shake off, pale, and breathless after a single flight of stairs. She had assumed all of it was simply what being pregnant felt like, and had not planned to mention any of it.
Clue 2
Partway through the consultation she says, almost in the middle of another sentence, that there is a craving that has taken over her days — and then stops. She would rather not say what it is for. She is not distressed about the pregnancy, not low in mood, and not anxious about the baby. She is embarrassed about something, and it takes a while before she is willing to name it.
Clue 3
For four months she has been eating ice, and not casually — several trays a day, refilling them overnight so there is a supply by morning. Her partner knows about that much and finds it funny. She does not. She eats her meals normally, has no fear of gaining weight, no concern about her body shape and no compensatory behaviours; her appetite for food is entirely intact. The ice is something separate, and she cannot stop.
Clue 4
There is more, and this is the part she has told nobody. On most days she scrapes small amounts of plaster from a damaged patch of wall in her hallway and eats it. She knows how it sounds. Cognitive screening is entirely normal across every domain, with an unremarkable developmental history — this is not occurring in the context of an intellectual disability. Renal and hepatic chemistry, including calcium, is normal.
Diagnosis
Pica
Why the diagnosis fits
Two presentations arrive in the same consultation and it is tempting to treat them separately: a tired, pale, breathless woman halfway through a pregnancy, and a private behaviour she is deeply ashamed of. They are the same problem. The diagnosis itself is defined by the behaviour — eating non-nutritive, non-food substances for at least one month, in a way not in keeping with the person’s developmental stage, with an age cut-off of 24 months or more suggested, and not socially normative or culturally acceptable. Every element is satisfied here: four months rather than one, an adult of 27 so no developmental question arises, and a behaviour that is not a practice in her family or community, which is precisely why she has concealed it. The substances themselves are typical; ice and earth or clay are among the commonest, alongside raw starches, charcoal, ash, paper, chalk and eggshells. What matters clinically is that this is usually a manifestation of an underlying medical condition, most often iron deficiency anaemia, and it is common in pregnancy, in children, and in people with intellectual disability. Her blood count — haemoglobin 8.9 g/dL with a mean cell volume of 68 fL — supplies that underlying condition, and the normal cognitive screen places her in the pregnancy-associated group rather than the intellectual disability one, which changes how the behaviour is understood and managed. The reason this needs acting on rather than reassuring away is the risk attached to what she is eating: lead poisoning is a recognised danger and is particularly serious in pregnancy, alongside parasitic infection, micronutrient deficiency and bezoar formation causing obstruction, ulceration or perforation. Management combines reducing exposure to the craved item, micronutrient supplementation and behavioural approaches. In pregnant women and children the behaviour often disappears without sequelae once the underlying deficiency is addressed — which is worth telling her, because she has spent four months assuming there was something shameful and inexplicable wrong with her.
Educational reference
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