If you've had one acute sinusitis episode, you know how disruptive it can be. The good news is that several evidence-based strategies can reduce your risk of recurrence. The bad news is that many popular "sinus prevention" products don't have strong evidence behind them. Here's what the clinical literature actually supports for preventing sinus infections.

Saline nasal irrigation

Saline irrigation — using a neti pot or squeeze bottle to rinse the nasal passages with isotonic saline — is the single best-supported intervention for both treating and preventing sinus symptoms. A 2016 Cochrane systematic review of randomized trials concluded that saline irrigation modestly improves symptoms in chronic rhinosinusitis and is well tolerated. Use distilled, sterile, or previously boiled water — CDC guidance on safe nasal rinse water warns against tap water due to rare but serious Naegleria fowleri infection.

Treat allergic rhinitis aggressively

Allergic rhinitis is a major risk factor for sinusitis. Inflamed nasal mucosa blocks sinus drainage, setting up the conditions for bacterial superinfection. If you have known allergies, treating them well — with intranasal corticosteroids (fluticasone, mometasone), antihistamines, or allergen immunotherapy — reduces sinus infection risk. Read more about how allergies overlap with sinus symptoms in our guide to sinus infection symptoms.

Humidifier use during dry months

Dry indoor air — common in winter when heating systems run — dries out the nasal mucosa, impairing mucociliary clearance (the natural sweeping mechanism that moves bacteria and debris out of the airways). A cool-mist humidifier maintaining 40–60% indoor humidity supports normal mucosal function. Clean the humidifier regularly per EPA guidance to prevent it from becoming a source of mold or bacterial contamination.

Avoid irritants

Cigarette smoke (both first-hand and second-hand), wildfire smoke, occupational dust, and strong chemical fumes all damage the sinus lining and impair clearance. If you smoke, quitting is the single most impactful sinus prevention step you can take. If you work in an environment with respiratory irritants, appropriate PPE (N95 or higher) reduces exposure.

Hand hygiene during respiratory virus season

Because most acute sinusitis follows a viral upper respiratory infection, reducing your risk of catching the underlying virus reduces your risk of subsequent sinusitis. Hand washing with soap and water, alcohol-based hand sanitizer when soap isn't available, and avoiding face-touching are all evidence-supported per the CDC. Influenza vaccination is also worth considering during flu season — fewer flu cases means fewer post-viral sinus infections.

When to see an ENT for recurring sinus infections

If you're getting 4+ episodes of acute sinusitis per year, or your symptoms last more than 12 weeks despite treatment, you may have chronic rhinosinusitis and warrant evaluation by an otolaryngologist (ENT). This is outside what telehealth can resolve — chronic rhinosinusitis sometimes involves anatomical issues (deviated septum, nasal polyps) that require imaging and possibly surgery. The AAO-HNS adult sinusitis guidelines describe the indications for specialist referral. CodyMD treats acute episodes — not chronic disease.

What doesn't have strong evidence

Vitamin C supplementation, zinc lozenges, echinacea, and most herbal supplements lack high-quality evidence for preventing sinus infections. They're not necessarily harmful, but they shouldn't replace the evidence-based strategies above. Be especially skeptical of products marketed as "natural antibiotics" — there are no over-the-counter antibiotics in the US, and the marketing terminology is misleading.

When prevention isn't enough

Even with the best prevention, some sinus infections happen. If yours meets the IDSA criteria for bacterial sinusitis, a licensed CodyMD doctor can review your case and prescribe appropriate antibiotics in 1 hour. Learn more about the licensed doctors who prescribe and how they decide whether you need antibiotics.

Bottom line on preventing sinus infections

Saline irrigation, allergy control, humidifier use during dry months, avoiding irritants, and good hand hygiene during respiratory virus season are the strategies with real evidence behind them. If you get recurring acute sinusitis, an ENT can evaluate for chronic disease. If a sinus infection breaks through, CodyMD can treat it by text in 1 hour.