American Society of Hirudotherapy

Manifestation of leech infestation as severe gastrointestinal bleeding in a 3-year-old boy: a case report and review of the literature

Case report published in BMC Pediatr (2022)

Last Updated: June 18, 2026Reviewed by: ASH Editorial Board
Research article — evidence reviewArticle reference
Evidence: Case reportSafety & Infection ControlClinical TrialsReihani H et al. · BMC pediatrics, 2022

Abstract

BACKGROUND: Leeches are a class of hermaphroditic parasites that can attach to various body parts and start sucking blood. Gastrointestinal (GI) bleeding due to leeches is a rare phenomenon that is more common in less developed countries. Common symptoms include melena, hematemesis, pallor, weakness, and fatigue. Due to the similar symptoms of this issue to the main differential diagnoses of GI bleeding in pediatrics, such as diarrhea, constipation, diverticulitis, esophagitis, and anal fissures, it is challenging to differentiate it from the rest. CASE PRESENTATION: We present a three-year-old boy who was transferred to our center with hematemesis, tarry stool, and a drop in hemoglobin level. He finally was diagnosed with a leech in his stomach. CONCLUSIONS: In less developed counties, the inability to reach safe drinking water, swim in lakes or springs, and inadequate awareness of public health information among individuals can be risk factors for leech infestation.

Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.

Publication typeReviewCase ReportsJournal Article
Indexed MeSH termsHumansChildChild, PreschoolDeveloping CountriesEatingGastrointestinal Hemorrhage

Summary

Case report and literature review of a 3-year-old boy who presented with severe GI bleeding due to leech infestation acquired from contaminated drinking water. Highlights diagnostic challenges and outcomes.

Why This Matters for Hirudotherapy

This case report describes a three-year-old boy transferred with hematemesis, tarry stool, and a drop in hemoglobin, ultimately diagnosed with a leech in his stomach. The abstract notes that gastrointestinal bleeding due to leeches is a rare phenomenon more common in less developed countries, with symptoms including melena, hematemesis, pallor, weakness, and fatigue, and lists risk factors such as inability to reach safe drinking water, swimming in lakes or springs, and inadequate public health awareness. For ASH's domain, the relevance is limited: this concerns pathological parasitic leech infestation, not controlled therapeutic hirudotherapy or the leech secretome, and the abstract describes no therapeutic application.

Citation

Manifestation of leech infestation as severe gastrointestinal bleeding in a 3-year-old boy: a case report and review of the literature.

Reihani H et al. · BMC pediatrics, 2022

Added to ASH library: May 27, 2026 · Site last updated: June 18, 2026

This website provides educational information and does not constitute medical advice, diagnosis, or treatment recommendations. Medicinal leech therapy carries clinically meaningful risks and should be performed only by qualified clinicians under institutionally approved protocols. FDA 510(k) clearance for medicinal leeches is limited to specific indications; investigational and off-label discussions are labeled accordingly. For patient-specific guidance, consult a qualified healthcare provider.