Nasal polyps: the soft growths that slowly switch off your nose
Last updated September 3, 2026.
Nasal polyps are soft, painless, non-cancerous growths of the sinus lining that hang into the nasal passages, usually on both sides, and gradually block breathing and, characteristically, the sense of smell. They are strongly tied to long-term inflammation (allergies, asthma, recurring sinus infections), they favor adults over 40, and the main treatment is steroids: first as sprays, sometimes as tablets, with surgery for the cases that outgrow the spray bottle.
What do they feel like?
A blocked nose that does not clear, for months; a lost or dulled sense of smell (often the first and most telling symptom, sometimes mistaken for aging); constant congestion, a runny or dripping nose, post-nasal drip, snoring, and a persistent feeling of pressure. Small polyps cause nothing; the symptoms grow as they do. Unlike a cold, nothing improves week to week; unlike allergies, antihistamines barely touch it.
Why do they happen?
Chronic inflammation of the nose and sinus lining is the engine, and certain companions make polyps much more likely: asthma (a large share of polyp patients have it), allergies, recurring sinus infections, aspirin sensitivity (the asthma-plus-polyps-plus-aspirin-reaction triad has its own name), and, in children, cystic fibrosis, which is why a child with nasal polyps always gets that checked. They are not cancerous and do not become cancer, but one-sided nasal blockage is always examined to be sure it is a polyp.
What actually treats them?
- Steroid nasal sprays: the first-line for everyone: daily use over weeks to months shrinks polyps and restores smell and breathing for many; technique and persistence decide the result.
- Steroid tablets: short courses shrink polyps dramatically (the medical polypectomy) when sprays are not enough; side effects cap how often they can be used.
- Saline rinses: large-volume salt-water rinses clear mucus and help the spray reach the lining.
- Biologic injections: for severe recurring disease (often with asthma), newer targeted injections shrink polyps and have changed the outlook for the worst cases.
- Surgery (polypectomy): day-case endoscopic removal when medications fail, usually with steroid sprays continued afterward, because polyps can and do regrow if the inflammation is not managed.
When is it an emergency?
Nasal polyps are routine care. Get assessed promptly for: blockage on one side only (needs examination: most one-sided growths are not polyps and some need ruling out urgently), nosebleeds that keep recurring on one side, double vision or eye swelling with the congestion (a same-day emergency: sinus infection spreading to the eye), severe headache with fever and facial swelling, and any polyp appearing in a child (cystic fibrosis testing is standard). Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why did I lose my sense of smell?
Mechanically: the polyps sit high in the nose where the smell nerves are, and both the physical blockage and the underlying inflammation shut odors out; smell loss is the polyp symptom, present in most patients and often the first thing noticed (frequently misread as a cold that never ended or an aging nose). The hopeful part: smell commonly returns, sometimes within days, when steroids shrink the polyps or surgery removes them, though long-standing loss recovers more slowly and occasionally incompletely. A return of smell on a steroid spray trial is practically diagnostic.
Will the spray really be enough, or will I need surgery?
The spray is enough for a large share: daily intranasal steroids shrink polyps and control the inflammation that grows them, with the catch being adherence (weeks of daily use, aimed slightly outward away from the septum) and the regrowth tendency if stopped. When sprays fall short, a short course of steroid tablets produces dramatic shrinkage for most, and the newer biologic injections do the same for severe recurrent disease. Surgery (endoscopic polypectomy, day case) is for the residual group, and even after surgery the spray continues, because the operation removes polyps but not the tendency.
Are nasal polyps cancer, or can they turn into it?
No: polyps are overgrown, inflamed normal lining, benign from birth and with no pathway to cancer. The reason the distinction still gets made carefully is the other way around: things that are not polyps can masquerade as them, and the rule is that one-sided nasal blockage, a one-sided polyp-looking growth, or blockage with recurrent one-sided nosebleeds gets examined and often biopsied, because genuine one-sided growths include tumors that must be caught early. Classic two-sided polyps in an asthmatic are what they look like; anything one-sided gets checked.
Is there a link with my asthma?
A strong one: asthma and nasal polyps share the same airway inflammation (the unified airway idea), and somewhere around a quarter to half of people with nasal polyps have asthma, with each condition flagging the other. There is also a specific triad worth knowing: asthma, nasal polyps, and reactions to aspirin and ibuprofen-type painkillers (worsening breathing or flushing after them), which has its own name and changes which painkillers are safe for you. Practical upside: treating the nose inflammation well often improves the asthma, and vice versa.
Why do they come back after treatment?
Because the treatments remove polyps, not the tendency: the underlying inflammation of the nose and sinus lining persists, so polyps regrow in a meaningful share of patients after tablet courses and even after surgery, sometimes over months to years. This is why maintenance is the unglamorous center of management: a daily steroid spray continued long-term after any treatment, saline rinses, managing the allergy and asthma alongside, and, for the frequently relapsing, the biologic injections that target the inflammation itself. Regrowth is expected biology, not failed care, and it is manageable.
My child seems to have nasal polyps. Is that different?
Yes, in one important way: nasal polyps are unusual in children, and when they appear, testing for cystic fibrosis is standard practice even without other symptoms, because polyps can be its first sign. Other childhood causes include allergies and (rarely) other conditions, so the child with polyps gets a proper workup rather than just a spray. The treatment ladder after that mirrors the adult one (steroid sprays first, surgery for refractory cases), and the prognosis with the cause identified and managed is good.