What causes allergic conjunctivitis?
Many things can cause conjunctivitis, including bacteria, viruses or allergens. When an allergen causes the irritation, the condition is called allergic conjunctivitis. This type of conjunctivitis is not contagious. Some common allergens include:
- Pollen from trees, grass and ragweed
- Animal skin and secretions such as saliva
- Skin medicines
- Air pollution
Written by familydoctor.org editorial staff