Common causes of<unk>  include bacteria, viruses, and environmental factors.
Viral<unk>  is the most common cause of infectious<unk>  both overall and in the adult population. Bacterial<unk>  is the second most common cause and is responsible for the majority of cases in children. Allergic<unk>  is the most frequent cause, affecting 15% to 40% of the population.
Noninfectious<unk>  includes keratoconjunctivitis sicca (dry eye syndrome) and superior limbic keratoconjunctivitis may cause by inflammation secondary to immune-mediated diseases or mechanical irritation.
Conjunctivitis causes
Rhinitis causes
Eye injury causes
Cough causes
Anaphylaxis causes
Rhinosinusitis causes
Vulvitis causes
Vertigo causes