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Rhinitis is inflammation and swelling of the mucous membrane of the nose, characterized by a runny nose and stuffiness and usually caused by the common cold (see Common Cold) or an allergy (see Seasonal Allergies).
Colds and allergies are the most common causes of rhinitis.
Symptoms of rhinitis include a runny nose, sneezing, and stuffiness.
Typically, the diagnosis is based on the symptoms.
The various forms of rhinitis are treated in various ways, such as with antibiotics, antihistamines, surgery, desensitization injections (sometimes called allergy shots), and avoidance of irritants.
The nose is the most commonly infected part of the upper airways. Rhinitis may be acute (short-lived) or chronic (long-standing). Acute rhinitis commonly results from viral infections but may also be a result of allergies, bacteria, or other causes. Chronic rhinitis usually occurs with chronic sinusitis (chronic rhinosinusitis).
Acute viral rhinitis (the common cold) can be caused by a variety of viruses. Symptoms consist of runny nose, sneezing, congestion, postnasal drip, cough, and a low-grade fever. Stuffiness can be relieved by taking decongestants, such as oxymetazoline or phenylephrine as a nasal spray or pseudoephedrine by mouth. These drugs, available over the counter, cause the blood vessels of the nasal mucous membrane to narrow (constrict). Nasal sprays should be used for only 3 or 4 days because after that period of time when the effects of the drugs wear off, the mucous membrane often swells even more than before. This phenomenon is called rebound congestion. Antihistamines help control runny nose but cause drowsiness and other problems, especially in older people (see Aging and Drugs). Antibiotics are not effective for acute viral rhinitis.
Allergic rhinitis is caused by a reaction of the body’s immune system to an environmental trigger. The most common environmental triggers include dust, molds, pollens, grasses, trees, and animals. Symptoms include itching, sneezing, runny nose, stuffiness, and itchy, watery eyes. People may have headaches and swollen eyelids and also may cough and wheeze. A doctor may diagnose allergic rhinitis based on a person’s history of symptoms. Often, the person has a family history of allergies. More detailed information may be obtained from blood tests or skin testing.
Avoiding the substance that triggers the allergy prevents symptoms but is often not possible. Nasal corticosteroid sprays decrease nasal inflammation caused by many sources and are relatively safe for long-term use. Antihistamines help prevent the allergic reaction and thus symptoms. Antihistamines dry the mucous membrane of the nose but many of them also cause sleepiness and other problems, especially in older people. Newer ones require a prescription but do not have as many of these side effects. Flushing a saltwater solution through the nose via a squeeze bottle or a bulb syringe (nasal irrigation) or using a saltwater spray as needed also can help symptoms. Injections that contain small amounts of the substance that triggers the allergy (called desensitization injections, or sometimes allergy shots) help to build long-term tolerance to specific environmental triggers, but they may take months or years to become fully effective. Antibiotics do not relieve the symptoms of allergic rhinitis.
Chronic rhinitis is usually an extension of rhinitis caused by inflammation or a viral infection. However, it also may rarely occur with diseases. These diseases include syphilis, tuberculosis, rhinoscleroma (a skin disease characterized by very hard, flattened tissues that first appear on the nose), rhinosporidiosis (an infection in the nose characterized by bleeding polyps), leishmaniasis, blastomycosis, histoplasmosis, and leprosy—all of which are characterized by the formation of inflamed lesions (granulomas) and the destruction of soft tissue, cartilage, and bone. Both low humidity and airborne irritants also can result in chronic rhinitis. Chronic rhinitis causes nasal obstruction and, in severe cases, crusting, frequent bleeding, and thick, foul-smelling, pus-filled discharge from the nose.
Decongestants may relieve symptoms. Any underlying infection requires a culture (examination of microorganisms grown from a sample of mucus to identify infection with bacteria or fungi) or biopsy (removal of a tissue sample for identification under a microscope) and appropriate treatment.
Atrophic rhinitis is a form of chronic rhinitis in which the mucous membrane thins (atrophies) and hardens, causing the nasal passages to widen (dilate) and dry out. This atrophy often occurs in older people. People who have granulomatosis with polyangiitis (formerly called Wegener granulomatosis) are also at risk. The cells normally found in the mucous membrane of the nose—cells that secrete mucus and have hairlike projections to move dirt particles out—are replaced by cells like those normally found in the skin. The disorder can develop in people who had a significant amount of intranasal structures and mucous membranes removed during sinus surgery. A prolonged bacterial infection of the lining of the nose is also a factor.
Crusts form inside the nose, and an offensive odor develops. People may have recurring severe nosebleeds and can lose their sense of smell (anosmia).
Treatment is aimed at reducing the crusting, eliminating the odor, and reducing infections. Antibiotics, such as bacitracin ointment applied inside the nose, kill bacteria. Estrogens sprayed into the nose or taken by mouth and vitamins A and D taken by mouth may reduce crusting by promoting mucosal secretions.
Vasomotor rhinitis is a form of chronic rhinitis. Nasal stuffiness, sneezing, and a runny nose—common allergic symptoms—occur when allergies do not seem to be present. In some people, the nose reacts strongly to irritants (such as dust and pollen), perfumes, pollution, or spicy foods. The disorder comes and goes and is worsened by dry air. The swollen mucous membrane varies from bright red to purple. Sometimes, people also have slight inflammation of the sinuses. If inflammation of the sinus is not severe, treatment is aimed at relieving symptoms. Avoiding smoke and irritants and using a humidified central heating system or vaporizer to increase humidity may be beneficial. Nasal corticosteroid sprays sometimes help. Nasal decongestant sprays should not be used. However, decongestants taken by mouth may be used for a few days at a time when symptoms are worst.
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