Vasomotor rhinitis is a condition of unknown origin that appears to be aggravated by fumes, odors, temperature and atmospheric changes, smoke, or other irritants. This form of rhinitis, which usually affects adults, causes year-round symptoms including congestion and headaches. Decongestants, topical steroids, and anticholinergic sprays are usually prescribed, though no known medications can give complete relief from symptoms.

Eosinophilic non-allergic rhinitis is named after the blood cell that distinguishes it from other forms — the eosinophil. This type of rhinitis behaves like allergic rhinitis in that it causes frequent bouts of sneezing and rhinorrhea (runny nose). It can appear seemingly out of nowhere and may be provoked by environmental changes such as air pressure changes or weather shifts. Antihistamines, decongestants, and topical Cromolyn or corticosteroids may be prescribed for this difficult-to-treat form of rhinitis.

Rhinitis medicamentosa occurs when topical decongestant nasal sprays are used to excess. This form causes increased congestion and is treated by discontinuing the use of the offending nasal spray. Topical or oral corticosteroids can also be used to help end nasal spray dependency. The patient may be advised to use Cromolyn sodium or corticosteroid nasal sprays instead, as these do not cause this problem.

Infectious rhinosinusitis is usually precipitated by a sinus or related infection but may also be associated with colds and flu. It causes postnasal drainage, sinus pain, and pus-filled secretions, which may be treated with decongestants, nasal saline solution, and antibiotics.

Structural rhinitis is caused by structural abnormalities in the nasal septum, normally resulting from an injury or congenital abnormality. This type can produce perennial (year-round) congestion that usually affects one side of the nose more than the other. There is no effective way to treat the symptoms medically, but surgery can be performed to correct the septal abnormalities.

Nasal polyps are growths on the mucous membrane that cause congestion and loss of sense of smell. They provoke symptoms year-round and usually first appear between the ages of 20 and 40. Nasal polyps may be associated with asthma and aspirin sensitivity, and can be treated with decongestants and topical corticosteroids.

Certain medications — including some antihypertensives, hormones, and oral contraceptives — may cause nasal congestion. Pregnancy and thyroid disease may also cause problems. Some individuals experience a runny nose while eating, a condition known as Gustatory Rhinitis.