Pica is the persistent eating of substances such as dirt or paint that have no nutritional value.
The Handbook of Clinical Child Psychology currently estimates that prevalence rates of pica range from 4%-26% among institutionalised populations.
If pica is suspected, a medical evaluation is important to assess for possible anaemia, intestinal blockages, or potential toxicity from ingested substances. If symptoms are present, the doctor will begin an evaluation by performing a complete medical history and physical exam. The doctor may use certain tests such as x-rays and blood tests to check for anaemia and look for toxins and other substances in the blood, and to check for blockages in the intestinal tract. The doctor also may test for possible infections caused by eating items contaminated with bacteria or other organisms. A review of the person’s eating habits also may be conducted.
Before making a diagnosis of pica, the doctor will evaluate the presence of other disorders such as mental retardation, developmental disabilities, or obsessive-compulsive disorder as the cause of the odd eating behaviour. This pattern of behaviour must last at least one month for a diagnosis of pica to be made.
Given the risk of medical complications (such as lead poisoning) associated with pica, close medical monitoring is necessary throughout treatment of the eating behaviour. Additionally, close collaboration with a mental health team skilled in treating pica is ideal for optimal treatment of these complex cases.
There are many potential complications of pica, such as paint chips, may contain lead or other toxic substances and eating them can lead to poisoning, increasing the child’s risk of complications including learning disabilities and brain damage. This is the most concerning and potentially lethal side effect of pica.
Eating non-food objects can interfere with eating healthy food, which can lead to nutritional deficiencies.
Eating objects that cannot be digested, such as stones, can cause constipation or blockages in the digestive tract, including the intestines and bowels. Also, hard or sharp objects (such as paperclips or metal scraps) can cause tears in the lining of the esophagus or intestines.
Bacteria or parasites from dirt or other objects can cause serious infections. Some infections can damage the kidneys or liver.
Co-existing developmental disabilities can make treatment difficult.