1 Blepharitis: Inflammation or infection of the eyelid that causes irritation or pain. 2  Conjunctivitis (commonly called pink eye): Inflammation of the conjunctiva caused by allergies or infections (viral or bacterial); blood vessels in the conjunctiva become engorged, and the normally white part of the eye looks red. Glaucoma: Eye condition that usually has no early symptoms. 2  In the case of acute angle-closure glaucoma, though, pressure inside the eye rises suddenly. 3  Symptoms include severe eye pain, nausea and vomiting, headache, and worsening vision.