Rhinitis may occur as a result of multiple systemic diseases including:
The most notable association is with thyroid disease. Clinical studies have shown nasal congestion in up to 64% of individuals with hypothyroidism, and complaints of excessive nasal discharge and recurrent colds have been noted in up to 55% of individuals with hypothyroidism.
Chronic nasal symptoms can be caused by a variety of unusual infections including:
These infections usually cause nasal ulcers and related crust formations which lead to nasal blockage and/or bleeding.
To treat the nasal symptoms associated with these conditions, it is important to treat the underlying disorder. In some circumstances nasal biopsies may be required to make a proper diagnosis.