DDx ⬇
- Viral or bacterial conjunctivitis
- Foreign body or corneal abrasion
- Keratitis (corneal ulcer or inflammation), eg, herpes simplex
- Trauma
- Acute glaucoma
- Orbital or periorbital cellulitis
- Ultraviolet (actinic) keratitis
- Eyelid disorder, eg, hordeolum, chalazion, blepharitis
- Inverted eyelash (eg, entropion)
- Dacryocystitis (lacrimal sac infection)
- Decreased tearing, eg, age-related, Sjögren's syndrome, anticholinergics
- Sinusitis
- Migraine or cluster headache
- Temporal (giant cell) arteritis
- Ophthalmic zoster (pain may precede rash)
- Uveitis
- Scleritis or episcleritis
- Optic neuritis
- Intracranial mass
Related DDx ⬆