During a well-child exam, a 3-year-old girl with known hearing loss and developmental delays lives in an old house with copper pipes and chipped paint. She reports abdominal pain, vomiting, constipation, and headaches. What condition is suspected?

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Lead exposure from old houses with chipped paint is a classic source of toxicity in young children. The combination of environmental risk—living in an old home with chipped paint—and the symptoms of abdominal pain, vomiting, constipation, and headaches fits lead poisoning well. In children, lead is highly neurotoxic and can cause developmental delays and hearing issues, which matches the girl’s history. Copper pipes can cause other issues but are not the source of lead exposure; the other conditions don’t align with this exposure pattern or the symptom cluster. Lead poisoning is the explanation that ties together the environmental clue and the gastrointestinal plus neurodevelopmental symptoms. If suspected, a blood lead level should be checked and exposure removed; management depends on the level and clinical impact.