Chronic rhinosinusitis without nasal polyps is a complex inflammatory condition affecting the sinuses and nose that lasts for at least 12 weeks, causing persistent symptoms like congestion, facial pressure, and nasal drainage—yet it remains less understood than its polyp-related counterpart.

How Treatment Approaches Can Help Manage Persistent Sinus Inflammation

When inflammation settles into the sinuses and nasal passages for more than three months without forming nasal polyps, it becomes a challenging condition to live with. This form of chronic rhinosinusitis—a long-term inflammation of the paranasal sinuses and nasal cavity—affects millions of people and can significantly reduce quality of life through constant discomfort and disruption of daily activities.^[1] Unlike temporary sinus infections that clear up within days or weeks, this condition persists, requiring ongoing management strategies tailored to individual patient needs.

The primary goals of treatment focus on reducing inflammation in the sinus tissues, improving the natural drainage pathways of the sinuses, clearing out infections when they occur, and helping patients breathe more comfortably. Treatment plans typically depend on the severity of symptoms, how long someone has been dealing with the condition, and whether other health problems like allergies or asthma are also present.^[4] Medical societies have established guidelines for standard treatments, while researchers continue exploring new therapies through clinical trials to find more effective options for those who don’t respond well to conventional approaches.

What makes chronic rhinosinusitis without nasal polyps particularly interesting is that it represents the majority of chronic sinus cases—accounting for about 70% of all chronic rhinosinusitis patients—yet it has been less extensively studied than the version with polyps.^[6] This condition is not simply a result of blocked sinus openings as once believed, but rather involves complex inflammatory processes in the lining tissues of the sinuses. Understanding this helps explain why treatment needs to address inflammation rather than just focusing on opening blocked passages.

Standard Treatment Approaches

The foundation of treatment for chronic rhinosinusitis without nasal polyps begins with conservative medical therapy that patients can use at home with guidance from their healthcare providers. The first-line approach combines two main strategies that have proven effective in reducing symptoms and improving sinus health.^[4]

Nasal Saline Irrigation

Nasal saline irrigation involves rinsing the nasal passages and sinuses with a saltwater solution. This simple technique helps remove irritants, allergens, mucus, and inflammatory substances from the nose. Studies have demonstrated that regular saline irrigation improves sinonasal symptoms in patients with chronic rhinosinusitis.^[4] The process works by mechanically cleansing the nasal cavity—similar to brushing teeth—and helps maintain healthy sinus function by supporting the natural clearance mechanisms.

Patients typically use a specially designed squeeze bottle or a device called a neti pot to deliver the saline solution into one nostril, allowing it to flow through the nasal passages and out the other nostril. The solution can be purchased pre-made or prepared at home using distilled or previously boiled water mixed with salt. Performing this irrigation once or twice daily can provide significant relief, and it’s generally safe with minimal side effects.^[2]

Intranasal Corticosteroid Sprays

Topical nasal corticosteroids represent the other cornerstone of first-line treatment. These medications are sprayed directly into the nose and work by reducing inflammation in the nasal lining and sinus tissues. Corticosteroids are powerful anti-inflammatory medications that calm down the immune system’s overactive response in the sinuses.^[4]

Common intranasal corticosteroid medications include fluticasone, budesonide, mometasone, and beclomethasone. Some of these are available without a prescription, while others require a doctor’s recommendation. Clinical evidence shows that intranasal corticosteroid sprays improve sinonasal symptoms in patients with chronic rhinosinusitis.^[4] These medications are generally used daily over extended periods—sometimes for months or years—as maintenance therapy to keep inflammation under control.

When used as directed, intranasal corticosteroids have a favorable safety profile. Because they act locally in the nose rather than throughout the entire body, side effects are typically mild and may include nasal dryness, minor nosebleeds, or throat irritation. These effects can often be minimized by proper spraying technique and using the medication consistently.

Oral Corticosteroids

When nasal sprays and saline rinses don’t provide sufficient relief, doctors may prescribe short courses of oral corticosteroids—pills taken by mouth that work throughout the entire body. These medications can reduce severe inflammation more rapidly than topical treatments. However, oral corticosteroids carry more significant potential side effects compared to nasal sprays, especially with long-term use.^[14]

Side effects from short courses of oral corticosteroids might include increased appetite, mood changes, difficulty sleeping, elevated blood sugar levels, and increased blood pressure. With repeated or prolonged use, more serious effects can occur including bone thinning, increased infection risk, and hormonal changes. For these reasons, oral corticosteroids are typically reserved for severe symptom flares or when other treatments haven’t been effective, and they’re used for limited periods—usually a few weeks at most.^[10]

Antibiotics

The role of antibiotics in treating chronic rhinosinusitis without nasal polyps remains somewhat controversial because this condition is primarily inflammatory rather than infectious in nature.^[4] However, antibiotics may be considered in specific situations, particularly when there is evidence of an acute bacterial infection superimposed on the chronic inflammation—for example, when symptoms suddenly worsen with increased colored nasal discharge, facial pain, and fever.

When antibiotics are prescribed, they are typically given for two to three weeks. Culture-directed antibiotics—medications chosen based on testing what bacteria are present—are recommended for patients experiencing acute flare-ups of their chronic condition.^[10] Some doctors also use long-term, low-dose antibiotic therapy for its anti-inflammatory effects rather than to kill bacteria. This approach, sometimes called macrolide therapy using medications like azithromycin, may help reduce inflammation through mechanisms beyond their antibacterial properties.

It’s important to understand that antibiotics are not a universal solution for chronic rhinosinusitis without nasal polyps, and their use must be carefully considered to avoid contributing to antibiotic resistance—a growing public health concern where bacteria become resistant to medications.

Additional Medical Therapies

For patients whose symptoms are related to allergies, additional treatments may be helpful. Antihistamines can reduce allergic reactions that contribute to nasal inflammation, while leukotriene receptor antagonists—medications that block inflammatory substances called leukotrienes—may also provide benefit.^[2] Allergy testing can identify specific triggers, allowing patients to avoid them when possible or consider immunotherapy (allergy shots or tablets) to reduce their allergic responses over time.

When Medical Treatment Doesn’t Work: Surgical Options

If comprehensive medical management fails to adequately control symptoms after an appropriate trial period—typically at least three months—surgery may be considered. Functional endoscopic sinus surgery is the most common surgical approach and has proven very effective for patients who don’t respond to medical treatment.^[2]

This surgery is performed through the nostrils using small instruments and a tiny camera called an endoscope. The surgeon removes diseased tissue, opens blocked sinus drainage pathways, and improves airflow and access for topical medications. The goal is not to “cure” the condition but to improve sinus drainage and reduce the burden of inflammation, making medical treatments more effective. Recovery typically takes a few weeks, and patients usually continue using nasal saline irrigation and corticosteroid sprays after surgery to maintain results.^[4]

Treatment in Clinical Trials

While standard treatments help many patients with chronic rhinosinusitis without nasal polyps, researchers are actively investigating new therapeutic approaches through clinical trials. These studies test innovative medications and treatment strategies that may offer better symptom control, particularly for patients who haven’t found adequate relief with current options.

Understanding Clinical Trial Phases

Clinical trials typically progress through three phases before a treatment can be approved for general use. Phase I trials primarily assess safety, testing new treatments in small groups of people to determine appropriate doses and identify side effects. Phase II trials expand to larger groups to evaluate whether the treatment works effectively for its intended purpose while continuing to monitor safety. Phase III trials involve even larger patient populations and compare the new treatment directly against current standard treatments to determine if it offers advantages.

Emerging Treatment Approaches

Several innovative treatment categories are being explored in research settings for chronic rhinosinusitis without nasal polyps. One area of focus involves understanding the specific inflammatory pathways active in this condition. While chronic rhinosinusitis with nasal polyps is often characterized by type 2 inflammation—a pattern involving certain immune cells called eosinophils—chronic rhinosinusitis without nasal polyps shows more variable inflammatory patterns.^[1]

In some patients, neutrophils—a different type of immune cell—appear to play a prominent role in the inflammation. Research has identified certain inflammatory molecules like TGF-β (transforming growth factor beta) and CXCL-8 (a chemical messenger that attracts neutrophils) as important factors in the tissue changes seen in chronic rhinosinusitis without nasal polyps.^[1] Understanding these mechanisms helps researchers develop treatments that target specific inflammatory processes.

Biologic Therapies

Biologic medications represent an exciting frontier in treating chronic rhinosinusitis. These are laboratory-made proteins that target specific components of the immune system. While several biologics have been approved for chronic rhinosinusitis with nasal polyps, research is ongoing to determine whether they might also benefit certain patients without polyps, particularly those with specific inflammatory profiles or coexisting conditions like severe asthma.

Biologics work by blocking particular inflammatory molecules or receptors, essentially interrupting the inflammatory cascade at specific points. Because chronic rhinosinusitis without nasal polyps appears to involve different inflammatory patterns in different patients—a concept researchers call endotypes—finding the right biologic for the right patient subgroup is an important research goal.^[1]

Investigating Disease Mechanisms

Beyond testing specific medications, clinical trials are also working to better understand the underlying causes of chronic rhinosinusitis without nasal polyps. Several factors have been identified that may contribute to disease development, including abnormal bacterial communities called biofilms that form on sinus tissues, defects in the immune system’s ability to respond to threats, problems with the protective barrier function of the tissue lining the sinuses, and environmental factors like smoking and pollution.^[1]

Research shows that certain diseases predispose people to developing chronic rhinosinusitis without nasal polyps, including allergic conditions, non-allergic airway diseases, disorders affecting the tiny hairs (cilia) that help move mucus out of the sinuses, immune deficiency conditions, and some autoimmune diseases.^[1] Understanding these connections helps researchers develop more targeted treatment approaches.

Tissue Changes and Remodeling

Chronic rhinosinusitis without nasal polyps causes specific changes in the sinus tissues that differ from those seen in the version with polyps. The tissue often shows thickening of the basement membrane (a layer of tissue beneath the surface cells), a condition called fibrosis, along with an increase in mucus-producing cells called goblet cells.^[1] These structural changes contribute to symptoms and affect how well treatments work. Research aimed at preventing or reversing this tissue remodeling could lead to better outcomes.

Geographic Availability of Clinical Trials

Clinical trials for chronic rhinosinusitis without nasal polyps are being conducted at research centers worldwide, including in the United States, Europe, and other regions. Major academic medical centers and specialized sinus care clinics often participate in these studies. Patients interested in learning about available trials can ask their doctors or search clinical trial registries to find studies recruiting in their area.

Eligibility for clinical trials depends on specific criteria that vary by study, but generally includes having a confirmed diagnosis of chronic rhinosinusitis without nasal polyps lasting at least 12 weeks, experiencing persistent symptoms despite standard medical treatment, and meeting age requirements (typically 18 years or older for most studies). Some trials may have additional requirements based on the specific treatment being tested or the research questions being asked.

Most common treatment methods

• Nasal saline irrigation
  • Uses specially designed squeeze bottles or neti pots to deliver saltwater solution through nasal passages
  • Mechanically cleanses the nose and sinuses of irritants, mucus, and inflammatory substances
  • Performed once or twice daily as part of ongoing management
  • Clinical evidence shows improvement in sinonasal symptoms
  • Generally safe with minimal side effects when performed correctly
• Intranasal corticosteroid sprays
  • Include medications such as fluticasone, budesonide, mometasone, and beclomethasone
  • Reduce inflammation directly in nasal and sinus tissues
  • Used daily as maintenance therapy, often for extended periods
  • Some available without prescription, others require medical recommendation
  • Mild side effects may include nasal dryness and minor nosebleeds
  • Act locally rather than throughout the entire body
• Oral corticosteroids
  • Prescribed for short courses when topical treatments provide insufficient relief
  • Work throughout the body to reduce severe inflammation rapidly
  • Typically limited to a few weeks to minimize side effects
  • Short-term effects may include appetite changes, mood changes, and sleep difficulties
  • Long-term use carries more serious risks including bone thinning and increased infection risk
• Antibiotics
  • Considered when acute bacterial infection complicates chronic inflammation
  • Culture-directed antibiotics recommended for acute exacerbations
  • Typically prescribed for two to three weeks when used
  • Long-term low-dose therapy sometimes used for anti-inflammatory effects
  • Macrolide antibiotics like azithromycin may reduce inflammation beyond killing bacteria
• Antihistamines and leukotriene receptor antagonists
  • Used when allergies contribute to sinus inflammation
  • Antihistamines block allergic reactions
  • Leukotriene receptor antagonists block inflammatory chemicals
  • May be considered as additional therapy alongside standard treatments
• Functional endoscopic sinus surgery
  • Performed when medical management fails after appropriate trial period
  • Uses small instruments and cameras inserted through the nostrils
  • Removes diseased tissue and opens blocked sinus drainage pathways
  • Improves airflow and access for topical medications
  • Very effective for patients unresponsive to medical treatment
  • Patients continue medical treatments after surgery to maintain results