Conjunctivitis Symptoms
Conjunctivitis typically presents with conjunctival injection (redness), discharge, and ocular irritation, with the specific pattern of symptoms helping differentiate between viral, bacterial, and allergic etiologies.
Core Symptoms to Assess
The primary symptoms of conjunctivitis that patients report include 1:
- Conjunctival injection (redness) - present in virtually all cases
- Discharge - character varies by etiology
- Itching - particularly prominent in allergic forms
- Tearing (watery eye)
- Irritation or foreign body sensation - reported in 92% of acute epidemic cases 2
- Mattering and adherence of eyelids - especially upon waking
- Photophobia (light sensitivity)
- Blurred vision - may persist even after infection clears 3
Symptom Patterns by Etiology
Viral Conjunctivitis
Most common overall cause 4. Presents with 1, 5:
- Watery discharge (not purulent) 6
- Abrupt onset, often sequentially bilateral
- Preauricular lymphadenopathy (distinctive finding)
- Foreign body sensation
- Associated upper respiratory infection symptoms
- Eyelid swelling and erythema
- Self-limited course (5-14 days for symptoms, though signs may persist 21+ days) 3
Critical finding: Subconjunctival hemorrhage and petechiae are distinctive for viral etiology 5.
Bacterial Conjunctivitis
Second most common infectious cause 4. Characterized by 1, 5:
- Purulent or mucopurulent discharge - thick, yellow-green
- Eyelids matted shut upon waking 6
- More common in children
- Usually unilateral initially, may become bilateral
- Less prominent itching compared to allergic forms
Gonococcal variant (medical emergency): Marked eyelid edema, copious purulent discharge, rapid progression within 1-7 days 1, 5.
Allergic Conjunctivitis
Affects nearly half the population 4. Distinguished by 1, 6, 7:
- Intense itching (hallmark symptom)
- Watery discharge with mucoid component
- Bilateral presentation
- Chemosis (conjunctival swelling)
- Eyelid edema
- Associated with personal/family history of atopy, asthma, or eczema
- Seasonal pattern (SAC) or year-round (PAC)
Physical Examination Findings
Beyond symptoms, clinicians should document 1:
Conjunctival Reaction Pattern
- Follicular (viral, chlamydial) - small bumps on tarsal conjunctiva
- Papillary (allergic, contact lens-related) - cobblestone appearance
Discharge Character
- Watery: viral or allergic
- Purulent/mucopurulent: bacterial
- Mucoid: allergic
Laterality
- Unilateral: bacterial (initially), HSV, molluscum
- Bilateral: viral (often sequential), allergic, chlamydial
Associated Findings
- Preauricular lymphadenopathy: viral, Parinaud oculoglandular syndrome
- Subconjunctival hemorrhage: viral (adenoviral)
- Vesicular eyelid lesions: HSV, VZV
- Corneal involvement: requires urgent evaluation
Red Flags Requiring Immediate Referral
Refer to ophthalmology immediately if 1, 4:
- Severe pain (not just irritation)
- Decreased vision
- Corneal involvement (infiltrate, ulcer)
- Recent ocular surgery
- Vesicular rash on eyelids or nose
- Neonatal conjunctivitis
- Immunocompromised state
- History of rheumatologic disease
- Painful pupillary reaction
Clinical Pearls
Duration matters: Viral symptoms typically improve within 5-14 days 5, but signs may persist beyond viral clearance 3. Bacterial conjunctivitis in adults is often self-limited. Chronic symptoms (>4 weeks) suggest non-infectious etiology or underlying ocular surface disease 1.
No single symptom differentiates viral from bacterial 6, but the constellation of watery discharge + preauricular node + sequential bilateral involvement strongly suggests viral, while purulent discharge + matted lids suggests bacterial.
Itching is the discriminator: Prominent itching points to allergic conjunctivitis, while its absence favors infectious causes 4, 7.