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GI foreign bodies may be classified by clinical impact, for example, partial or complete obstruction, or by the nature of the foreign body, such as a discrete or linear foreign body. In addition, the foreign body may be classified by the location of the obstruction it creates within the GI tract into high (stomach or proximal duodenum), mid (jejunum), and low (ileocecocolic junction) obstruction and whether it has resulted in perforation.

The possible types of discrete foreign bodies are limited only by one's imagination. Discrete GI foreign bodies that have been reported include magnets, latex teats, wood foreign bodies, (such as skewers or ice pop sticks) sewing needles, batteries, corn cobs, pet toys, children's toys, and solidified wood glue (Figure 5.1) [2,5–10]. Linear foreign bodies may include items such as carpet, clothing, plastic, towel, cloth, thread, and string [11–13]. The type of foreign body is important, as it impacts clinical signs and influences the direction of diagnostics and therapeutic intervention. For instance, discrete foreign bodies, in some cases, can be removed via emesis or endoscopic techniques, while linear foreign bodies that have resulted in clinical signs require surgical intervention.