Group ingestion of high‐powered magnets in children—A clinical and public health challenge

Abstract

High‐powered magnets are a preventable cause of serious gastrointestinal injury in children, with ingestion often resulting in hospitalization and occasionally surgery. We report six classmates, aged 5–6 years, who ingested high‐powered magnets during a single school day after mistaking them for candy. All presented to our emergency department within 12 h of ingestion. Three underwent endoscopy and three were managed with serial imaging; all magnets were retrieved or passed spontaneously, with no obstruction, perforation, or surgery. The near‐simultaneous presentations strained endoscopy resources and required coordinated triage by magnet number, configuration, and symptoms. The U.S. Consumer Product Safety Commission defines these magnets for users ≥14 years, yet all patients were under 7, underscoring age‐based labeling limitations. To our knowledge, this is the first reported cluster of simultaneous classroom magnet ingestion, highlighting persistent exposure despite regulation and the need for standardized triage protocols and national surveillance.

What Is Known

• High‐powered magnet ingestion in children can cause severe gastrointestinal injury, including perforation, fistula formation, and the need for endoscopic or surgical intervention.

• Multiple magnet ingestion carries a higher risk of complications than single ingestion.

• Injury rates have fluctuated with regulatory changes by the U.S. Consumer Product Safety Commission, and warning labels alone have proven insufficient for prevention.

• Current guidelines emphasize imaging surveillance and urgent intervention when magnets fail to progress or symptoms develop.

What Is New

• This is the first reported cluster of simultaneous high‐powered magnet ingestion among multiple children in a single classroom.

• Group ingestion events create unique triage and resource‐allocation challenges not addressed in current guidelines.

• School‐based exposures highlight gaps in prevention despite existing sales restrictions and policies prohibiting outside toys.

• The series underscores the need for standardized triage protocols, a national magnet‐ingestion registry, and dedicated ICD‐10 codes.

1. INTRODUCTION

Foreign body (FB) ingestion is a common pediatric emergency, with approximately 100,000 cases reported annually in the United States. ¹ Children younger than 6 years account for 80%–90% of cases, particularly toddlers engaging in exploratory behavior. Older children more often ingest objects during play, through peer influence, or intentionally. While most FBs pass spontaneously, some cause life‐threatening complications. ² Among the most hazardous are high‐powered magnets, which frequently cause gastrointestinal bleeding, perforation, ulceration, necrosis, and fistula formation, often necessitating hospitalization, endoscopy, and sometimes surgery.

The U.S. Consumer Product Safety Commission (CPSC) defines a high‐powered magnet as any loose or separable magnet that fits entirely within the CPSC small‐parts cylinder and has a magnetic flux index of 50 kG²·mm² or greater. ³ , ⁴ Such magnets are sold in sets of tens to hundreds and marketed as desk toys, fidget objects, or educational aids. They vary in size (typically 3–10 mm), shape (spherical, cylindrical, or cubic), color, and strength, with flux indices commonly ranging from 300 to over 700 kG²·mm²—roughly 6–14 times the regulatory threshold and 5–20 times stronger than refrigerator magnets. ² Their shiny appearance and smooth shape make them attractive to young children and easy to swallow. Ingestions in young children such as ours are typically accidental—here the magnets were mistaken for candy—and differ from the intentional or dare‐related ingestions occasionally seen in adolescents.

Although the CPSC removed high‐powered magnets from the U.S. market in 2012, they returned in 2016 following federal court decisions. ³ , ⁵ , ⁶ Since 2009, emergency care for magnet‐related injuries has risen 6.1% annually. CPSC regulations initially reduced emergency department (ED) visits from 3.58 to 2.83 per 100,000 after 2012, but rates rose to 5.15 per 100,000 between 2016 and 2019 after the rule reversal. ⁶ In 2022, the CPSC approved a new federal standard requiring that small, separable magnets be either too large to swallow or below a 50 kG²·mm² flux index. Many magnets involved in ingestions were about 5 mm neodymium spheres with flux indices of 300–400 kG²·mm², and some ferrite types exceeded 700 kG²·mm². CPSC staff estimated that from 2010 to 2020, about 23,700 magnet ingestions were treated in U.S. EDs, with roughly 4200 requiring hospitalization or transfer—a burden that persisted beyond 2019 and prompted the stricter 2022 rule. ⁴

These trends demonstrate the influence of regulatory changes on injury rates. Safety advocates and clinicians have recommended prohibiting the sale of high‐powered magnets, whereas manufacturers argue that warning labels suffice. In a survey of 173 caregivers, however, more than 90% did not notice or read the labels and nearly half misidentified the magnets as toys, ⁷ indicating that labeling alone is inadequate. Moreover, magnet ingestion often occurs at daycare centers or schools, where supervision may be limited. ⁸ We present a novel cluster of multiple children in one class ingesting varying numbers of high‐powered magnets on the same day—group ingestion not previously described—despite a school “no toys from home” policy, underscoring the need for targeted school‐based education alongside parental education.

2. METHODS

2.1. Ethics statement

Informed consent was obtained from all patients’ guardians for publication of case details.

2.2. Study design

We conducted a retrospective chart review of six pediatric patients who presented to our ED in June 2024 following ingestion of high‐powered magnets. Data—demographics, clinical presentation, imaging findings, management, and outcomes—were extracted from the electronic medical record. Given the descriptive nature of the series, no formal statistical analysis was performed.

3. RESULTS

Six classmates aged 5–6 years presented to our ED after ingesting varying numbers of magnets that one student had brought to school, mistaking them for candy. An estimated 10–15 children were exposed; detailed information was unavailable for those evaluated outside our institution, though the school notified parents and urged medical evaluation even for asymptomatic children. All six presented on the same day, within 12 h of ingestion. The first four arrived nearly simultaneously, and the on‐call gastroenterologist was notified of all four during the initial telephone call; the remaining two arrived approximately 2 h later.

Because several children potentially required endoscopy at the same time, cases were triaged by magnet number, radiographic configuration, and symptoms. Multiple magnets were prioritized over a single magnet; among children with multiple magnets, a linear configuration was prioritized over magnets clustered in a ring, out of concern that a linear arrangement is more likely to trap a fold of bowel between magnets, and because the child with a linear cluster reported abdominal pain whereas the child with a ring configuration was asymptomatic. Endoscopy was performed approximately 3–5 h after ED arrival, and radiographs were repeated beforehand to confirm magnet position, as intervals elapsed while the shared endoscopy suite was in use (Table 1).

Table 1.

Clinical summary for individual patients.

	Patient 1	Patient 2	Patient 3	Patient 4	Patient 5	Patient 6
Age (years)	6	6	5	6	6	6
No. magnets ingested	12	3	2	2	1	2
Symptoms	None	Abdominal pain	None	None	Abdominal pain	None
Physical exam	Normal	Normal	Normal	Normal	Normal	Normal
Time of ED arrival	16:18	16:43	18:33	18:42	16:47	16:57
Initial X‐ray	Ring‐shaped FB in LUQ, likely stomach	3 radiopaque FBs overlying gastric lumen	2 FBs overlying gastric antrum; at ~3 h, distal stomach/proximal small bowel, closely opposed	Radiopaque FBs suspected in stomach; at ~2 h in LUQ, unlikely gastric	FB overlying abdomen, possibly duodenum/small bowel, mild small‐bowel dilatation	Small round FB in lower midline abdomen
Endoscopy findings	FB not visualized	3 magnets in gastric fundus removed	FB not visualized	N/A	N/A	N/A
Time to endoscopy (from ED arrival)	4 h 42 min (EGD 21:00)	3 h 17 min (EGD 20:00)	3 h 44 min (EGD 22:17)	N/A	N/A	N/A
Follow‐up X‐ray	Moved to RLQ, possibly distal ileum/cecum	N/A	Moved to small bowel, possibly right colon	Day 2: colon or small bowel; day 5: no FB	Moved to LUQ, colon or small bowel; outside film: no FB	N/A
Magnets seen in stool	Yes	N/A	Yes	No	No	Yes

Abbreviations: ED, emergency department; EGD, esophagogastroduodenoscopy; FB, foreign body; LUQ, left upper quadrant; N/A, not applicable; RLQ, right lower quadrant.

3.1. Endoscopy cases

Case 1: 6‐year‐old girl, asymptomatic. X‐ray showed a ring‐shaped FB in the left upper quadrant, likely gastric (Figure 1A). Magnets were not visualized endoscopically; follow‐up imaging showed distal migration (Figure 1B), and the magnets passed spontaneously.

Figure 1.

Ingested magnets min Cases 1 and 2. (A) Initial abdominal X‐ray showing ring‐shaped magnets in the left upper quadrant, likely gastric (Case 1). (B) Follow‐up abdominal X‐ray (Case 1) showing distal migration of the ring‐shaped magnets. (C) Linear cluster of three magnets in the gastric body retrieved at endoscopy (Case 2).

Case 2: 6‐year‐old girl, mild abdominal pain. X‐ray showed a linear cluster of three magnets in the gastric body. Magnets were retrieved endoscopically with a FB retrieval net (Figure 1C).

Case 3: 5‐year‐old girl, asymptomatic. X‐ray showed two magnets in the right upper quadrant; a repeat X‐ray about 3 h later, just before endoscopy, showed them in the distal stomach or proximal small bowel. Magnets were not visualized endoscopically; next‐day imaging showed progression into the distal small bowel or colon, and they passed spontaneously.

3.2. Non‐endoscopy cases

Case 4: 6‐year‐old boy, asymptomatic. The initial X‐ray showed two magnets in the stomach. Because the child remained asymptomatic, the two magnets moved together as a unit, and repeat imaging about 2 h later demonstrated migration to the small bowel beyond endoscopic reach—while endoscopy capacity was committed to classmates with clustered magnets—serial imaging was elected rather than endoscopy. Films on day 2 showed no residual FB; the magnets passed spontaneously.

Case 5: 6‐year‐old boy, mild pain. X‐ray localized one magnet to the duodenum or small bowel; imaging confirmed passage.

Case 6: 6‐year‐old girl, asymptomatic. X‐ray showed one magnet in the midline abdomen; it passed spontaneously.

4. DISCUSSION

Group magnet ingestion poses distinct clinical and public‐health challenges. Our series highlights the burden of magnet ingestion and the need for stronger prevention and defined management guidelines, including in asymptomatic children. It is instructive for three main reasons: it documents a previously unreported exposure setting ‐ simultaneous ingestion by multiple classmates; it exposes the absence of triage protocols when several children need urgent endoscopy at once; and it illustrates that such exposures continue despite regulation and school policy. Notably, none of our patients developed obstruction, perforation, or fistula, required prolonged admission, or proceeded to surgery—an outcome consistent with early presentation and prompt, guideline‐based management that should not obscure the well‐documented potential for severe harm.

That potential is substantial. In a 25‐hospital U.S. cohort of 596 magnet exposures, 276 children (46.3%) required endoscopy, surgery, or both, 332 (55.7%) were hospitalized, and 57 (9.6%) sustained life‐threatening morbidity, although there were no deaths. ⁸ Multiple‐magnet ingestion drives most of this risk: magnets that bridge adjacent bowel walls can cause pressure necrosis, fistula, obstruction, and perforation, and reported rates of surgery rise steeply with the number of magnets ingested. Balanced against this, observational cohorts show that asymptomatic children whose magnets demonstrate radiographic progression can pass them without complication under close serial‐imaging surveillance ‐ the course followed successfully by three of our patients.

Triage is the central lesson of simultaneous presentations. We suggest the following pragmatic approach, adapted from North American Society for Pediatric Gastroenterology, Hepatology, and Nutrition (NASPGHAN) and European Society for Paediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) guidance. ² , ⁹ First, a radiograph should be obtained for every suspected ingestion and rapidly stratified by magnet number, configuration, and location: a single magnet with no co‐ingested metal can usually be observed, whereas multiple magnets, a magnet plus another metallic object, clustered or linear configurations, or any peritoneal signs warrant urgent gastroenterology and surgical consultation. Second, children with multiple or clustered magnets still within endoscopic reach (stomach or duodenum) and those with symptoms should be prioritized for endoscopy; magnets beyond reach in an asymptomatic child are managed expectantly. Third, when demand exceeds endoscopy capacity, radiographs should be repeated at defined intervals ‐ more frequently for magnets within reach or not progressing, and at least daily for those progressing distally ‐ escalating to endoscopic or surgical removal if a magnet fails to advance, the child develops symptoms, or films suggest entrapment. NASPGHAN recommends non‐operative inpatient management with a bowel regimen and serial radiographs for asymptomatic children with multiple magnets past the stomach, with removal if progression stalls (typically beyond about 48 h) or symptoms arise. ⁹ ESPGHAN similarly emphasizes early joint gastroenterology‐surgery involvement and urgent removal of magnets within endoscopic reach. ² Importantly, imaging cannot reliably exclude bowel‐wall entrapment between magnets, so clinical vigilance must accompany surveillance, and no direct evidence yet guides how to prioritize among simultaneous ingestions.

Several practical difficulties recurred in our cases: delayed or absent symptoms in children who might not otherwise seek care, difficulty localizing magnets on X‐ray that led to unsuccessful endoscopic retrieval, and loss of the endoscopic window once magnets migrated beyond the stomach. These reinforce the value of early imaging and predefined pathways.

Determining that the magnets were high‐powered without a product label relied on convergent evidence: the retrieved and radiographic magnets were small (about 5 mm) neodymium‐type spheres that formed the characteristic rings and linear chains seen on imaging; they exerted strong mutual attraction across tissue at endoscopy; and the original online packaging retained by a family (Figure 2) corresponded to a magnet set advertised with flux indices in the 300–700 kG²·mm² range—well above the 50 kG²·mm² regulatory threshold. Such determination is limited when products are unlabeled, itself an argument for stronger labeling and post‐market controls.

Figure 2.

Original online packaging of the ingested magnet set (unlabeled).

Prevention and surveillance both require strengthening. Under current law sales are restricted to ages ≥14, ³ yet all our patients were ≤6, showing that age‐based restrictions alone are ineffective; several bodies advocate outright prohibition rather than reliance on labels. ¹⁰ Surveillance is likewise inadequate: there is no dedicated national magnet‐ingestion registry and no specific ICD‐10 code, so cases are captured only through nonspecific foreign‐body codes and voluntary databases, hampering accurate tracking. The button‐battery experience offers a model—the National Battery Ingestion Hotline has provided real‐time triage guidance and a national case registry for decades—and a comparable magnet registry, paired with dedicated ICD‐10 codes and mandatory manufacturer reporting, would strengthen both surveillance and prevention. In our case, the unlabeled magnets were reported to the CPSC, and, in coordination with the school principal, parents were informed by letter and follow‐up calls to encourage pediatric evaluation of exposed but asymptomatic children; no formal mechanism currently exists to ensure that all exposed children are identified and evaluated.

5. CONCLUSION

Magnet ingestion remains a preventable cause of significant morbidity in children, and group ingestions add triage and resource challenges not addressed by current guidelines. Collaboration among clinicians, regulators, and educators is urgently needed. Priorities include enhanced public and school‐based education using age‐appropriate materials; stricter enforcement of sales restrictions, with consideration of outright prohibition and child‐resistant packaging; standardized triage protocols for both single and simultaneous ingestions; and robust post‐market surveillance—a national magnet‐ingestion registry, dedicated ICD‐10 codes, and mandatory manufacturer reporting. Together these measures can reduce access, improve awareness, and support a timely, coordinated response when exposures occur.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.