Differential Diagnosis for Pus Coming Out of Eye with Red and Painful Eye
- Single Most Likely Diagnosis
- Blepharitis or Conjunctivitis: These are common conditions that can cause redness, pain, and discharge (including pus) from the eye. The presence of pus suggests a bacterial infection, which is often seen in conjunctivitis or blepharitis.
- Other Likely Diagnoses
- Keratitis: An infection of the cornea that can cause pain, redness, and discharge. It can be bacterial, viral, or fungal and is a common cause of these symptoms.
- Dacryocystitis: An infection of the lacrimal sac, which can cause pain, redness, and discharge. It often presents with swelling and tenderness over the lacrimal sac area.
- Endophthalmitis: Although less common, this is an intraocular infection that can cause severe pain, redness, and vision loss. It is often associated with recent eye surgery or trauma.
- Do Not Miss Diagnoses
- Orbital Cellulitis: An infection of the tissues surrounding the eye, which can cause redness, pain, and swelling. It is a medical emergency because it can lead to serious complications, including vision loss and cavernous sinus thrombosis.
- Panophthalmitis: A severe infection that involves both the internal and external structures of the eye. It is a rare but potentially devastating condition that requires immediate medical attention.
- Rare Diagnoses
- Syphilis: Can cause a variety of eye symptoms, including uveitis and conjunctivitis, in its different stages. While rare, it is an important consideration in patients with risk factors.
- Gonococcal Conjunctivitis: Caused by Neisseria gonorrhoeae, this condition can lead to severe conjunctivitis with significant discharge. It is more common in neonates (acquired during birth) but can also occur in adults.
- Fungal Keratitis: More common in contact lens wearers or after trauma with organic matter, this condition can cause severe pain, redness, and vision loss. It requires specific antifungal treatment.