Pink Eye or Allergies? How to Tell

The phrase "pink eye" covers a few completely different conditions that look almost identical: bacterial conjunctivitis (needs antibiotic drops), viral conjunctivitis (no antibiotics, supportive care), and allergic conjunctivitis (antihistamines or other allergy treatment).

Why does the distinction matter? Antibiotic drops won't help a viral infection. Antihistamines won't fix bacterial pink eye. Both bacterial and viral conjunctivitis are highly contagious; allergies are not.

Bacterial conjunctivitis

Bacterial pink eye is what most people picture when they hear "pink eye":

• Thick yellow or green discharge. Often crusted shut in the morning.
• Usually starts in one eye and may spread to the other within a few days.
• Redness of the white of the eye.
• Mild discomfort — burning or gritty feeling, rarely severe pain.
• Eyelid sticking together after sleep.

Treatment is topical antibiotic drops or ointment. Most cases resolve in a few days with treatment. Children usually need to stay home from daycare/school until 24 hours after starting antibiotics.

Viral conjunctivitis

Viral pink eye is more common and looks slightly different:

• Watery discharge rather than thick pus.
• Both eyes often affected within a day or two of each other.
• Pink-red eye with a "blood-shot" appearance.
• Often follows a recent cold or other upper respiratory infection.
• Highly contagious for up to 2 weeks.

Treatment is supportive: cool compresses, artificial tears, avoiding eye contact and shared towels. Antibiotics don't help. Most cases resolve in 1-2 weeks.

Allergic conjunctivitis

Allergic pink eye is distinguished by:

• Itching is the dominant symptom — often intense.
• Both eyes always affected at the same time.
• Watery discharge, not pus.
• Other allergy symptoms — sneezing, itchy nose, sometimes itchy throat.
• Seasonal pattern or trigger-specific (cat dander, dust).
• Eyelid swelling can be prominent.

Treatment is antihistamines — either oral (cetirizine, loratadine) or topical eye drops (olopatadine, ketotifen).

How we tell at urgent care

Diagnosis usually comes from history and physical exam:

• Discharge type. Thick and yellow = bacterial. Watery + crusty = viral. Watery + itchy = allergic.
• One eye or both. Bacterial often starts in one. Viral and allergic typically affect both.
• Itching vs. burning. Itching is the hallmark of allergic.
• Recent exposures. Sick contacts, recent cold, allergy seasons, new contact lenses, makeup.
• Other symptoms. Cold symptoms suggest viral. Allergy symptoms suggest allergic.

When pink eye needs more than urgent care

Some presentations warrant ophthalmology or emergency referral:

• Severe eye pain beyond mild discomfort
• Vision changes — blurring that doesn't resolve with blinking
• Light sensitivity (photophobia)
• Trauma or foreign body sensation
• Contact lens wearers with eye pain — concern for keratitis
• Newborns or infants with eye discharge
• Pink eye not improving after 3-5 days of antibiotics

What to do at home

• Cool compresses relieve discomfort for all types.
• Artificial tears flush irritants and provide comfort.
• Don't share towels, washcloths, or pillows if contagious cause is suspected.
• Avoid contact lenses until the eye is clear.
• Wash hands frequently.

Walk in for same-day pink eye evaluation

Sage Urgent Care is open every day from 8 AM to 8 PM. Pink eye visits are usually under 30 minutes.