<unk>  can be caused by infectious microorganisms or non-infectious agents. It is usually caused by viruses but may be caused by bacterial or fungal etiology. Gastroesophageal reflux disease (GERD) or particularly extraesophageal reflux (EER) can also cause acid<unk>  in adults and children.
Pharyngitis causes
Tonsillitis causes
Rhinosinusitis causes
Epiglottitis causes
Cough causes
Croup causes
Rhinitis causes
Conjunctivitis causes