The short answers

What filler does: Adds volume onlyIt cannot remove bone or cartilage, so it cannot make a nose smaller.
Effect on breathing: None from fillerFiller does not treat a deviated septum, valve collapse or any other cause of nasal obstruction.
How long each lasts: Filler typically 8 to 12 monthsSurgery is not reversible, and the result commonly takes 12 to 18 months to settle.
Anaesthesia and downtime: General anaesthesia for surgery, not for fillerA filler session makes no incision, though a topical or local anaesthetic may be used. Surgery means a splint until around day 6 to 8. Desk work commonly resumes at 1 to 2 weeks.
Minor side effects of filler: Common, mostly redness and swellingOverall complication incidence was 39.11 percent in a review of 9,657 patients, erythema and swelling accounting for 27.95 percent.
Serious vascular complications: Reported at up to 0.27 percentVascular occlusion can cause skin necrosis, stroke or permanent blindness, and the nose is the most common injection site in published cases of filler induced blindness.

Filler and surgery are often presented as a lighter and a heavier version of one treatment. They are not. One adds volume outside the nose, the other rebuilds what is underneath.

What each can change, how long it lasts and the risks all follow from that. Non-surgical rhinoplasty is covered in full here.

One adds volume, the other removes tissue

An updated systematic review in Aesthetic Plastic Surgery, covering 30 studies and 9,657 patients, recorded hyaluronic acid in 96.76 percent of treatments. It is placed in the soft tissue outside the nose.

Filler adds volume. It does not remove bone or cartilage, it does not narrow anything, and it does not open the nasal airway.

Camouflaging a small hump, by filling above and below it, makes the profile read straighter while making the nose marginally larger. A nose someone wants smaller is a surgical question.

Filler is not a rehearsal for surgery either: it adds where surgery would remove, so it cannot preview a reduction.

What each one can change

Read down the column that matches what you want changed.

Every row is drawn from the evidence on this page. Neither column is the better one.
What you want changed	Filler	Surgery
A small dorsal hump	Camouflaged by adding volume above and below it	Reduced by removing bone and cartilage
A smaller nose	Not possible. Camouflage makes the nose marginally larger	Only surgery removes tissue
Breathing	No effect on a deviated septum, a narrow nasal valve or turbinate obstruction	Functional surgery addresses the airway directly
Structure	Cannot address significant deviation, a significant change in tip rotation or collapse	Cartilage support and grafting
How long it lasts	Typically 8 to 12 months, so maintaining it repeats the same risk	Not reversible, and commonly 12 to 18 months to settle
Main risks	Mostly redness and swelling. Rare vascular occlusion causing skin necrosis, stroke or usually permanent blindness	General anaesthesia, weeks of recovery, and possible revision surgery

The risk filler carries and surgery does not

Most of what goes wrong with filler is minor and usually settles. The same review of 9,657 patients put overall complication incidence at 39.11 percent, mostly erythema and swelling at 27.95 percent.

The serious risk is different in kind. Filler injected into an artery, or compressing one, can block the blood supply to the skin and cause tissue death.

Travelling backwards into the ophthalmic circulation, it can block the blood supply to the eye and cause sudden, permanent blindness, or a stroke.

In the same pooled review, serious vascular complications including blindness, skin necrosis and stroke were reported at up to 0.27 percent. Uncommon, and not reversible.

Sudden vision change is an emergency

Blanching or mottled skin, severe or increasing pain, any change in vision or pain around the eye can signal vascular occlusion. That needs immediate medical assessment rather than waiting.

What the published visual loss cases show

The nose is the most common injection site in reported cases of filler induced blindness. A 2024 review in the Aesthetic Surgery Journal collated 511 published cases.

The cases run from 1906 to 2023. Of them, 365 were published between September 2018 and March 2023.
The nose was the most common site of all, at 40.6 percent of the recent cases and 37.4 percent across the whole period, ahead of the forehead and the glabella.
Hyaluronic acid accounted for 79.6 percent of the recent cases, so a hyaluronic acid product does not remove this risk.
Visual outcomes were documented in 318 cases. Of those, 6.0 percent recovered completely, 25.8 percent improved partially and 68.2 percent had no recovery at all.
Central nervous system complications were present in 34.0 percent of cases, and 19.2 percent showed stroke like features.
Retrobulbar hyaluronidase improved vision in only 2 of 38 attempts, which is 5.3 percent.

Hyaluronidase dissolves hyaluronic acid and helps an unwanted result or early skin level vascular compromise, but is far less reliable once the eye is involved. Reversibility is not safety.

The authors state that prevention remains the most effective strategy, because no single treatment reached statistical significance. An expert consensus on minimising this risk is in the sources below.

Which question are you actually asking

If what you want is a reduction, a straighter framework or an easier airway, filler cannot deliver it at any dose. That is surgery, functional surgery, or after previous surgery revision.

Filler suits a small hump camouflaged, a slightly under-projected tip lifted or a shallow depression filled, temporarily, with the vascular risk attached.

The practitioner matters more than the product

Ask the medical qualification of whoever injects or operates, whether hyaluronidase is stocked on site with a written protocol, and who is responsible after you fly home. All three are answerable in writing, and our doctors will answer them.

Questions to ask a surgeon

Take these to a consultation. The consultation checklist is built to be printed and written on, and our doctors will answer questions sent through the site before you travel.

Which of the things I want changed can filler actually do, and which of them need surgery?
What is your medical qualification, and will you be injecting or operating personally?
Is hyaluronidase stocked in this room, and what is your written protocol if you suspect vascular occlusion?
Has this nose had surgery or filler before, and how does that change where filler can safely be placed?
If I have filler now, does it make a later operation harder, and what are you basing that on?
Who do I contact, and where do I go, if my vision changes after I have flown home?

Sources

Every source below was opened and checked. We link to health authorities, peer-reviewed journals and professional bodies, and to nothing else.

Nonsurgical rhinoplasty: an updated systematic review of technique, outcomes, complications and their treatmentAesthetic Plastic Surgery, via PubMedCurrent evidence on what filler can and cannot achieve, and its complication profile.
A consensus on minimizing the risk of hyaluronic acid embolic visual lossAesthetic Surgery Journal, via PubMed CentralExpert consensus on the rare but serious vascular occlusion risk. Linked because this risk should not be downplayed.
Dermal filler risks and safetyAmerican Society of Plastic SurgeonsProfessional society guidance on filler risk.