Nasal polyps almost never go away on their own. These soft, painless growths in the lining of your sinuses or nasal passages are driven by a cycle of chronic inflammation that sustains itself, meaning the tissue typically persists or grows larger without treatment. The good news is that steroid sprays can shrink many polyps significantly within just two to four weeks, and more advanced options exist for stubborn cases.
Why Polyps Don’t Resolve on Their Own
A nasal polyp isn’t a temporary swelling that your body will eventually reabsorb. It forms because of a self-reinforcing loop of inflammation deep in the nasal lining. Immune cells beneath the surface release chemical signals that promote swelling, excess mucus production, and structural changes in the tissue itself. These signals also activate nearby cells like fibroblasts (the cells that build connective tissue), leading to collagen buildup and thickening that gives polyps their physical structure.
Critically, the nasal lining contains a reservoir of immature immune cells that continuously mature into new inflammatory cells, replenishing the cycle even when existing inflammation partially calms down. This is why polyps tend to persist or grow rather than shrink. The body’s own repair mechanisms get overwhelmed by this ongoing inflammatory process, and in some patients, hybrid immune cells form that can resist even standard treatments like steroid sprays. There is no documented case of a nasal polyp in a human spontaneously disappearing without any form of treatment.
What You Might Be Confusing for a Polyp
Before assuming you have a polyp, it’s worth knowing that swollen turbinates, the normal ridges of tissue inside your nose, can look and feel a lot like polyps when they’re inflamed. Turbinate swelling from allergies or a cold can block one or both nostrils and create a sensation of a mass inside the nose. Unlike polyps, swollen turbinates do resolve once the irritation passes. A doctor can distinguish between the two with a simple look inside your nose using a small camera or light.
How Steroid Sprays Shrink Polyps
Intranasal corticosteroid sprays are the first treatment for nearly all nasal polyps. They work by dialing down the inflammatory signals that keep polyp tissue growing. A meta-analysis of 14 studies found that people using steroid sprays were three times more likely to see a meaningful reduction in polyp size compared to those using a placebo, with noticeable shrinkage in as little as two to four weeks.
For many people with small to moderate polyps, consistent daily use of a steroid spray is enough to control symptoms long-term. The polyp may not vanish entirely, but it can shrink enough that breathing, smell, and drainage improve substantially. If your nasal passages are completely blocked and the spray can’t physically reach the polyps, a short course of oral steroids can temporarily shrink the tissue enough to let the spray do its job.
Saline Rinses Help but Won’t Shrink Polyps
Saline nasal irrigation (using a neti pot or squeeze bottle) is commonly recommended alongside steroid sprays, but it doesn’t reduce polyp tissue on its own. What it does is flush out thick mucus, allergens, and irritants, which can reduce congestion and make the steroid spray more effective by clearing a path to the polyp surface. Some products add surfactants to saline rinses claiming to break up bacterial films in the sinuses, but there isn’t strong evidence this helps, and it may actually worsen your sense of smell.
When Surgery Becomes the Next Step
If polyps don’t respond adequately to sprays and rinses, endoscopic sinus surgery is the standard next step. A surgeon uses a thin, flexible scope to remove polyp tissue and widen the sinus openings, improving both airflow and the ability of medications to reach inflamed areas afterward.
Surgery is effective at restoring breathing and smell, but it doesn’t cure the underlying inflammation that caused the polyps in the first place. Recurrence rates reflect this: about 30% of people see polyps return within five years, and roughly 66% experience recurrence within ten years. This is why ongoing use of steroid sprays after surgery is important for keeping new growth in check.
Biologic Medications for Resistant Cases
For people whose polyps keep coming back despite surgery and steroid therapy, a newer class of injectable medications called biologics can target the specific immune pathways driving polyp growth. These drugs block the chemical signals (particularly those that promote the type of inflammation and tissue remodeling characteristic of polyps) at their source. Current guidelines recommend biologics for patients with polyps that remain uncontrolled after both standard medical treatment and surgery. They require ongoing injections, typically every two to four weeks, but can dramatically reduce polyp size and improve quality of life in people who have run out of other options.
What Happens If You Leave Polyps Untreated
Small polyps that aren’t causing symptoms may not need aggressive treatment right away, but polyps that are ignored indefinitely tend to grow. Progressive nasal obstruction, worsening loss of smell, recurring sinus infections, and chronic facial pressure are the most common consequences. In rare but serious cases, extensive polyp growth has caused erosion of the thin bones separating the sinuses from the eye sockets and brain cavity, leading to vision problems and neurological complications. These extreme outcomes are uncommon, but they illustrate why polyps that are growing or causing symptoms shouldn’t simply be left alone in hopes they’ll resolve.