1. Allergies — Injury, such as from a blunt trauma or burn.
  2. Blepharitis — which is eyelid inflammation.
  3. Chalazion — caused by clogged oil glands on the eyelid.
  4. Complication from a recent eye surgery.
  5. Contact lens complication.
  6. Corneal abrasion (scratch): First aid
  7. Corneal herpes infection.
  8. Corneal ulcer.
  9. Dry eyes
  10. Ectropion — which is an outwardly turned eyelid.
  11. Entropion — which is an inwardly turned eyelid.
  12. Episcleritis — which is inflammation of the covering of the white part of the eye.
  13. Eye drops side effect or complication.
  14. Floppy eyelid syndrome — which happens when the eyelid can easily fold on itself.
  15. Foreign object in the eye: First aid
  16. Glaucoma — which is part of a group of conditions that damage the optic nerve.
  17. Hay fever
  18. Injury — such as from blunt trauma or a burn.
  19. Iritis — which is inflammation of the colored part of the eye.
  20. Keratitis — which is inflammation of the cornea.
  21. Orbital cellulitis — which is an infection of the area around the eye.
  22. Pink eye (conjunctivitis)
  23. Scleritis — which is inflammation of the white part of the eye.
  24. Subconjunctival hemorrhage (broken blood vessel in eye)
  25. Uveitis — a form of eye inflammation that affects the middle layer of tissue in the eye wall.

Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.