Chronic rhinitis is persistent inflammation of the nasal passages, while chronic sinusitis (more accurately called chronic rhinosinusitis) is inflammation that extends into the sinus cavities and lasts at least 12 weeks. The two conditions overlap significantly because the nose and sinuses are connected, and inflammation in one area frequently spreads to the other. About 2.1% of U.S. adults meet the symptom criteria for chronic rhinosinusitis at any given time, making it one of the more common chronic conditions.
How Rhinitis and Sinusitis Differ
Rhinitis refers specifically to inflammation of the nasal lining. Its hallmark symptoms are congestion, a runny nose (either dripping forward or down the back of the throat), sneezing, and itchiness. These symptoms can come and go or persist for months to years, but the inflammation stays mostly in the nose itself.
Sinusitis involves the paranasal sinuses, the air-filled pockets behind your forehead, cheeks, and eyes. When the sinuses become inflamed, the symptoms shift toward facial pain or pressure, headaches, pain in the upper teeth, and thick, discolored mucus. A reduced or lost sense of smell is also common. In practice, nasal inflammation almost always accompanies sinus inflammation, which is why clinicians use the combined term “rhinosinusitis” rather than “sinusitis” alone.
The key distinction for the chronic forms is time. Chronic rhinosinusitis is diagnosed when symptoms persist for more than 12 consecutive weeks. A regular sinus infection (acute sinusitis) typically resolves in under four weeks. A subacute phase falls between four and twelve weeks. If your symptoms have lingered past that three-month mark, the condition is considered chronic and usually requires a different treatment approach than a standard infection.
Types of Chronic Rhinitis
Chronic rhinitis falls into two broad categories: allergic and nonallergic. Allergic rhinitis is triggered by an immune reaction to substances like pollen, dust mites, pet dander, or mold. It tends to cause prominent sneezing and nasal itchiness alongside congestion, and it may be seasonal or year-round depending on the trigger.
Nonallergic rhinitis has at least eight recognized subtypes. The most common is nonallergic rhinopathy (previously called vasomotor rhinitis), where the nasal lining overreacts to things like temperature changes, strong odors, or dry air. Congestion and a runny nose are the main complaints, but sneezing and itchiness are typically absent. Other subtypes include:
- Gustatory rhinitis: a runny nose triggered by eating, especially hot or spicy foods
- Hormonal rhinitis: nasal congestion linked to pregnancy, thyroid conditions, or other hormonal shifts
- Drug-induced rhinitis: caused by overuse of decongestant nasal sprays or by certain medications like blood pressure drugs
- Senile rhinitis: a chronic runny nose that develops with aging
- Atrophic rhinitis: thinning and crusting of the nasal lining, often after surgery or infection
Identifying which type you have matters because the treatments differ. Allergic rhinitis responds well to antihistamines and allergen avoidance, while nonallergic forms often do not.
Two Forms of Chronic Rhinosinusitis
Chronic rhinosinusitis is further divided based on whether nasal polyps are present. CRS without nasal polyps (CRSsNP) involves chronic sinus inflammation without visible growths. CRS with nasal polyps (CRSwNP) involves soft, painless, noncancerous growths that develop on the lining of the sinuses or nasal passages, often causing more significant congestion and loss of smell.
The distinction is clinically important. Polyp-driven disease tends to involve a different pattern of immune activity, recurs more frequently, and may require different medications or surgical approaches. Your doctor can check for polyps during a nasal examination using a small camera or scope.
What Causes Chronic Sinus Inflammation
There is rarely a single cause. Chronic rhinosinusitis results from the interaction of structural, immune, and environmental factors. Structural issues like a deviated septum, narrow sinus openings, or scar tissue from prior surgery can block normal drainage and trap mucus. Once drainage is impaired, bacteria and fungi have an easier time establishing themselves.
Bacterial biofilms play a particularly stubborn role. These are colonies of bacteria that attach to the sinus lining and encase themselves in a protective layer, making them far harder to eliminate than a typical infection. Research has implicated biofilms in more than 65% of chronic infections in humans, and studies have found that these biofilm communities often contain both bacteria and fungi living together. About 22% of chronic rhinosinusitis patients in one study had fungal biofilms alongside bacterial ones.
Systemic conditions can also feed into the problem. These include immune deficiencies, autoimmune diseases, cystic fibrosis, acid reflux, and aspirin sensitivity (sometimes called Samter’s triad, a combination of asthma, nasal polyps, and aspirin reactions). Environmental contributors like smoking, air pollution, and ongoing allergen exposure add further fuel.
How It’s Diagnosed
A diagnosis of chronic rhinosinusitis requires at least two symptoms lasting more than 12 weeks, with at least one of those being nasal blockage/congestion or nasal discharge (either from the front of the nose or dripping down the throat). Facial pain or pressure and a reduced sense of smell are the other symptoms that count toward the diagnosis.
Symptoms alone aren’t enough for a definitive diagnosis. There also needs to be visible evidence of inflammation, which a doctor can look for using nasal endoscopy (a thin, flexible camera inserted into the nose) to check for swollen tissue, pus, or polyps in the sinus drainage pathways. CT imaging of the sinuses can also confirm the diagnosis by showing thickened sinus walls, fluid buildup, or blocked openings.
Treatment Approaches
First-line treatment for chronic rhinosinusitis centers on reducing inflammation and improving sinus drainage. Saline nasal irrigation, done with a squeeze bottle or neti pot, physically flushes out mucus, allergens, and irritants. It’s simple, inexpensive, and consistently supported by evidence as a foundation of management. Most people use it once or twice daily.
Corticosteroid nasal sprays are the other mainstay. These work by reducing the swelling of the nasal and sinus lining, which helps restore drainage. They’re applied directly to the nose and have minimal systemic side effects compared to oral steroids. For people with nasal polyps, the spray may need to be used long-term to keep polyps from growing back.
When polyps are severe or don’t respond to standard treatment, newer injectable medications called biologics can target the specific immune pathways driving polyp growth. These are typically reserved for people who haven’t improved with other options.
Surgery becomes an option when medical treatment fails to provide adequate relief. Functional endoscopic sinus surgery (FESS) uses a camera and small instruments inserted through the nostrils to widen the natural sinus drainage pathways, remove polyps, and clear out diseased tissue. There are no external incisions. Recovery generally involves a few weeks of congestion and mild discomfort, with gradual improvement over one to three months. Surgery doesn’t cure the underlying inflammation, so most people continue nasal sprays and rinses afterward to maintain results.
Possible Complications
Serious complications from chronic sinusitis are uncommon but worth knowing about. Because the sinuses sit directly next to the eye sockets and the brain, infection can occasionally spread to these areas. Orbital complications range from swelling around the eye (preseptal cellulitis) to deeper infections like an orbital abscess. Intracranial complications, though rare, include meningitis, brain abscess, and blood clot formation in the veins near the sinuses. These complications are estimated to occur in roughly 1 in 1,000 cases of acute flare-ups and are most dangerous when not recognized early. Warning signs include worsening vision, severe headache, high fever, or swelling and redness around the eye.