Acute Hemorrhagic Conjunctivitis

急性出血性结膜炎

Evidence-backed informationEN 5/7 applicable sections · ZH 5/7 applicable sectionsUpdated Sep 3, 2026

Conjunctivitis, commonly termed pink eye, represents an inflammatory condition of the ocular conjunctiva that produces characteristic redness, tearing, and discharge. Etiologies predominantly include viral agents in adults, bacterial pathogens in children, and environmental allergens, with highly contagious enteroviral variants capable of triggering rapid-onset painful hemorrhagic presentations. Most infections follow a self-limiting course, typically resolving within one to two weeks without specific medical intervention. ^[1]^[2]

Read the full clinical and epidemiological profile6

Definition

This entity is clinically characterized as an acute inflammatory disorder of the transparent mucous membrane lining the inner eyelids and covering the sclera. It encompasses diverse pathological triggers ranging from adenoviral and enteroviral infections to immunologic reactions against seasonal or perennial aeroallergens. The clinical spectrum spans mild irritation to severe ocular pain accompanied by subconjunctival hemorrhage, generally following a benign trajectory. ^[1]^[2]

Clinical features

Affected individuals frequently report ocular erythema, excessive watering, itching, burning, or a gritty sensation, with discharge consistency varying from watery to purulent based on the underlying etiology. Viral presentations often coincide with upper respiratory tract symptoms and pre-auricular lymphadenopathy, whereas allergic variants are distinguished by prominent pruritus. Severe manifestations may involve marked pain and visible subconjunctival bleeding, occasionally associated with rare neurological complications. ^[1]

Epidemiology

Viral pathogens account for the vast majority of adult cases and a smaller proportion of pediatric infections, with adenoviruses constituting the leading infectious agent. Allergic triggers represent the most frequent overall cause, influencing a substantial segment of the population and driving seasonal primary care utilization during warmer months. Historically, highly transmissible enteroviral strains originated from localized regional outbreaks before achieving global dissemination and repeatedly generating epidemic cycles. ^[1]

Transmission

Infectious forms propagate efficiently through direct person-to-person contact and fomites, enabling rapid community-level circulation particularly in close-contact settings. Highly contagious enteroviral variants demonstrate exceptional transmissibility, necessitating strict behavioral modifications to interrupt chain-of-transmission dynamics. Non-infectious allergic variants bypass microbial pathways entirely, developing solely through direct exposure to specific environmental or topical irritants. ^[1]^[2]

Prevention

Primary mitigation relies on consistent hand hygiene practices and targeted public education campaigns designed to minimize unwarranted anxiety and discourage unverified domestic treatments. Disseminating clear, evidence-based guidance to both affected individuals and broader communities remains critical for curbing contact-based spread and managing population-level expectations during active circulation periods. Clinical management varies according to etiology, with specific populations requiring targeted therapeutic approaches to limit further spread. ^[1]^[2]

References

1Wikipedia contributors. Conjunctivitis - Wikipedia [Internet]. Wikipedia. cited 3 Sept 2026.Available from: https://en.wikipedia.org/wiki/Conjunctivitis
2Wright PW et al. Acute hemorrhagic conjunctivitis. Am Fam Physician. 1992 Jan. PMID: 1309404.PubMed: https://pubmed.ncbi.nlm.nih.gov/1309404/

Coding Register

ICD-10: B30.3
ICD-11: 9A60.1

Key Statistics

Total cases: 800K
Total deaths: 4
Peak month: 2023-09
Coverage: 2 reporting countries · 2010-01-01 → 2026-08-30

Coverage

Reporting countries and regions

2 locations

Trends by reporting country

Monthly patterns over time

Rows14,202

Updated2026-09-01

Coverage—

Partitions6

Source2 series · 6,675 observations

Official sourcesAuthority, cadence, notes66

MONTHLYweb

Monthly notifiable infectious disease reports published by China CDC.

MONTHLYweb

Official China public health bulletin and query portal.

MONTHLYweb

Biomedical literature discovery feed used as supplementary context.