What each of the three causes looks like on examination, how the finding determines thread type, count and direction, and what happens when the wrong cause is treated.
Two people can point at the same part of their face, describe the same complaint in the same words, and need completely different procedures. This is the single most consequential fact about facial descent, and it is almost never explained.
The reason is that sagging is a description of an appearance, not a diagnosis. Three separate mechanisms produce that appearance. They are distinguishable on examination but not from a photograph, and each one calls for a different plan — different thread type, different number, different direction, different fixation.
This page sets out what each of the three looks like when it is examined, how the finding translates into a design, and what specifically goes wrong when the wrong one is treated. Individual regions of the face have their own pages, as does the question of when a thread lift is not the right instrument at all.
Facial descent has three mechanisms. Skin: the covering has lost elasticity and no longer recoils, so the envelope is slack though little has travelled. Fat: the compartments of facial fat have shifted position or diminished, so volume is present in the wrong place or absent from the right one. Retaining ligaments: the fibrous anchors holding soft tissue to deeper structures have loosened, so tissue has moved as a unit along a definite path. Ligamentous descent responds best to repositioning. Skin laxity limits how much of any correction shows and holds. Volume change is not a lifting problem at all. Most faces show a combination, and the plan is built around whichever predominates.
On this page
- Why "sagging" is not a diagnosis
- Skin: what it looks like on examination
- Fat: position and volume as two separate findings
- Retaining ligaments: descent with a direction
- Reading a mixed picture
- How the finding becomes a design
- The same complaint, two designs
- What happens when the wrong cause is treated
- What you can observe yourself, and what you cannot
- Questions patients ask
Why "sagging" is not a diagnosis
Consider what a patient can actually see. A fold that was not there before. A jawline that has lost its edge. A shadow beside the mouth. Fullness under the chin.
Each of these is a surface appearance produced by tissue sitting somewhere other than where it used to. What none of them reveals is which of three quite different processes put it there — and that is what determines the plan.
The situation is comparable to a patient reporting a headache. The symptom is real and precisely described; the treatment depends entirely on the cause, and the cause is not visible in the symptom.
This is why a consultation that begins with a recommendation has skipped a step, and why the same complaint from two patients can produce two different designs. It is also why comparing what two people were given for "the same problem" tells you very little.
Skin: what it looks like on examination
The first mechanism is the covering itself losing elasticity.
What is happening. Skin behaves as an envelope with a degree of recoil. As that recoil diminishes, the envelope no longer contracts onto the structures beneath it. The tissue underneath may have travelled very little; the covering over it has become slack.
How it is assessed. By hand. Skin is lifted gently and released, and what is observed is how readily it returns. Skin with good recoil snaps back; skin with reduced recoil returns slowly or incompletely. Its thickness is judged at the same time, and so is how firmly it is bound to the tissue beneath — a covering that slides freely behaves differently under a repositioned framework from one that is tethered.
What it looks like. Fine surface laxity, a crepey quality in some regions, and a general softening of edges rather than a discrete mass sitting lower than it should. Where skin laxity predominates, the face tends to look diffusely less defined rather than specifically displaced.
Why it matters to the plan. Skin condition sets a ceiling on how much of any correction reaches the surface and how long it holds. A lift is held partly by the tissue's own recoil, so where that contribution is small, the material carries more of the load — and the material is absorbable. Skin laxity is rarely the finding a plan is aimed at; it is the finding that qualifies everything else.
Fat: position and volume as two separate findings
The second mechanism is frequently described as one thing and is actually two, which is the source of a good deal of confusion.
What is happening. Facial fat is not a continuous layer. It sits in discrete compartments separated by fibrous partitions. Over time, some compartments descend while others diminish, and the two produce different appearances.
Descent of fat means volume that is still present but has moved. The face reads as heavier in the lower regions and emptier in the upper ones — the same material, differently distributed.
Loss of fat volume means the material is diminished rather than displaced. This produces hollowing, and a hollow casts a shadow. The shadow reads as a fold, which the patient reasonably describes as sagging.
How they are told apart. Manual repositioning is the key test. Tissue is lifted into a corrected position and the region is observed. Where the fold resolves, displacement is contributing. Where it persists with the tissue held up, something other than displacement is producing it — most often a shortage of volume beneath.
Position matters too. Descent behaves differently lying down than sitting up, because gravity is acting differently on displaced tissue. A hollow looks much the same in either position.
Why the distinction is decisive. Displaced volume can be repositioned. Diminished volume cannot be — there is nothing to move into the hollow, and pulling harder produces a tighter face rather than a fuller one. Where the finding is loss rather than displacement, the useful approaches are volume-based, and the boundary this creates for thread lifting is set out in the page on when a thread lift is not the right choice.
Retaining ligaments: descent with a direction
The third mechanism is the one thread lifting is best suited to, and the one least often described to patients.
What is happening. Fibrous structures anchor the soft tissue of the face to the deeper structures and to bone. They hold tissue in position against gravity and against the constant movement of expression. As they loosen, the tissue they were holding travels.
What distinguishes it. The descent is directional. Because the tissue was held at particular points and has been released from them, it has moved as a unit along a definable path rather than settling diffusely. That path is the single most important finding for the design, because a correction that runs along it in reverse returns tissue towards where it came from, whereas a correction along any other line moves tissue somewhere it has never been.
How it is assessed. By observing how the tissue moves. It is repositioned by hand in several directions, and what is noted is which direction produces a natural correction rather than merely a change. Ligamentous descent has a direction in which it "wants" to go back; skin laxity does not, because there is no discrete mass being moved.
What it looks like. More pronounced and more locally defined than skin laxity. A discrete region sitting lower than it should, with a corresponding emptiness above it, and edges that are displaced rather than blurred.
Why it responds well. There is something to reposition, there is a path to reposition it along, and there are fixation points that make holding it possible. This is what a thread lift is built to do.
Reading a mixed picture
Almost no face presents one mechanism cleanly. The examination therefore produces a weighting rather than a label, and that weighting is what the plan is built from.
Three combinations recur.
Ligamentous descent with skin laxity. The commonest picture. There is tissue to reposition, and the covering will transmit and hold less of that correction than a firmer one would. The plan is built around repositioning; the skin finding determines how much of it will show and how long it will last, and it is disclosed as part of the expected result rather than discovered afterwards.
Fat descent with volume loss. Volume has moved from one region and diminished in another. A lifting procedure addresses the first; the second needs volume. These are sequenced rather than merged, and which comes first depends on which is dominant.
Predominant volume loss with minimal descent. The complaint sounds like sagging and the finding is not. Here a lifting procedure is aimed at the wrong mechanism, and saying so is the useful outcome of the consultation.
How facial proportion, direction of descent, and skin condition are read together into a single design is set out in the page on diagnosing the cause of sagging before the threads.
How the finding becomes a design
The translation is direct, and it runs in one order: mechanism first, then design, then material.
Direction follows the path of descent. Where ligamentous descent predominates and the tissue has travelled along a definable path, the correction runs along that path in reverse. This is the finding that most changes the result, and it is why direction is designed from the face rather than applied as a standard pattern — the subject of the page on thread direction and vector.
Thread type follows the tissue. Different materials do different work: some are selected for holding strength where a collapsed line needs to be brought back into position, some for repositioning volume-bearing tissue in the midface, some where change in the skin itself is part of the aim. Which is chosen follows from skin elasticity, fat distribution, and the cause of the descent — set out in the page on how a thread type is chosen.
Number follows the design. At Edition the average is around 14, adjusted according to the degree of descent, skin thickness, the amount of fat, facial structure, and the intended direction of lift. It is an outcome of the plan rather than an input to it.
Fixation follows the anatomy. Where a correction is anchored determines whether it holds, and the appropriate points differ between faces.
The same complaint, two designs
An abstract way to see the whole chain is to take one sentence a patient might say and follow it through two different sets of findings. The sentence is: "the line beside my mouth has appeared and my jaw is not as sharp as it was."
Findings A. Skin recoil is good. Tissue lifted upward and outward by hand moves as a unit, the line beside the mouth resolves while it is held, and there is a corresponding emptiness in the cheek above. The direction in which the correction looks natural is clear and consistent.
This is displacement with a path. The design is built around repositioning along that path, anchored where the anatomy allows it to hold; thread type is chosen for holding strength in the region where the line has collapsed, and the number follows from how much has to be moved and how far.
Findings B. Skin returns slowly when lifted and released. The line beside the mouth persists when the tissue is held up. There is hollowing in the cheek without corresponding fullness below it, and the appearance changes little between lying down and sitting up.
This is predominantly volume loss on a covering with reduced recoil. Repositioning has little to work with, and the honest account is that a lift would produce a modest and short-lived change while leaving the hollow that is casting the shadow. The useful conversation is about volume, and about what a lift would and would not add alongside it.
Same sentence, same region, opposite conclusions. Nothing in the complaint distinguished them; everything in the examination did.
What happens when the wrong cause is treated
Each misreading produces a characteristic disappointment, and knowing them makes the reasoning above concrete.
Treating volume loss as descent. The face becomes tighter without becoming fuller. The hollow remains and can look more defined, because tension has been added around it. The patient describes the result as "it did not do anything" — accurately, because the mechanism was never addressed.
Treating skin laxity as ligamentous descent. The correction is applied to tissue that has no discrete mass to move. The visible change is modest, it settles quickly, and the temptation is to add more threads — which increases the risk of surface irregularity without changing the finding.
Treating ligamentous descent as skin laxity. The opposite error. A treatment aimed at the covering is applied to a face whose tissue has genuinely travelled. The surface may improve slightly; the displacement remains, because nothing has been repositioned.
Getting the direction wrong. The subtlest failure and the hardest to describe. Tissue is repositioned, so something has changed, but along a line it did not descend. The face looks altered rather than restored — often described as looking pulled, or as no longer quite recognisable — and the mechanism is entirely a matter of vector.
What you can observe yourself, and what you cannot
Some of this is worth attempting before a consultation, and some of it is not.
Useful to bring. Which region concerns you and in which view. Whether the change was gradual or noticed at a point. Whether there has been significant weight change. An older photograph, if you have one — it shows the direction of travel better than any description.
A test you can try. In a mirror, lift the tissue of the cheek gently upward and outward with your fingertips and observe whether the fold you are concerned about resolves. If it disappears, displacement is contributing. If it remains, something else is producing it. This is a rough version of what is done at examination, and it is not conclusive, but it is more informative than looking.
Not useful to attempt. Deciding which mechanism predominates, or which thread you want. Skin recoil, tissue mobility, and the direction of descent are assessed by hand, and a conclusion reached in advance tends to become a constraint on a plan that has not been made yet.
Questions patients ask
Can I tell from a photograph which cause I have?
No, and neither can anyone else. All three produce a similar image. They are distinguished by how the tissue behaves when it is repositioned by hand and in different positions, which is not visible in a photograph.
Do I have to have only one cause?
Almost nobody does. The examination establishes which predominates and by how much, and the plan is built around that weighting. Where two are close, a combined or sequenced approach may be appropriate.
If my skin has lost elasticity, is a thread lift useless?
Not useless, but qualified. Skin condition determines how much of a correction reaches the surface and how long it holds. Where there is also tissue to reposition, a lift still does its work — with a smaller and shorter-lived visible result than the same design would produce on firmer skin. That should be described before the procedure rather than after.
Why does the direction matter so much?
Because tissue that has descended has travelled along a particular path. Returning it along that path restores a position it previously occupied. Moving it along any other line puts it somewhere it has never been, which is why some results look altered rather than refreshed.
How long does the examination take?
The consultation runs approximately 20 to 30 minutes, of which the examination is a substantial part. It is not a glance — skin recoil, tissue mobility, and the direction of movement each have to be assessed.
What if the cause turns out to be one that threads do not address?
Then that is what you will be told, along with what would address it. Establishing the mechanism is the point of the examination, and a finding that leads away from a thread lift is a useful result rather than a wasted appointment.
About the author
Dae-hee Han, MD — Board-Certified Plastic Surgeon (specialist certificate No. 2045, issued 3 March 2014; medical licence 00394, issued 26 February 2009). Master’s degree, Ajou University School of Medicine. Training at the Craniofacial Center, Chang Gung Memorial Hospital, Taiwan (2013), and the IFAAS Mini Fellowship, University of Florida, USA (2016). Three rhinoplasty papers published in SCIE-indexed international journals. More than 4,500 nose surgeries — Dr. Han’s career total from 2017 to 2025, counted from medical records. Eighteen years in practice since medical licensure in 2009; thirteen years as a board-certified plastic surgeon. He carries out consultation, surgery and follow-up personally; fee guidance is given by the clinic’s consultation manager.
Last reviewed: 2026-08-15
Clinic information
Edition Plastic Surgery Clinic & Dermatology
6F, OPUS 407, 407 Gangnam-daero, Seocho-gu, Seoul 06614, Republic of Korea
One minute on foot from Gangnam Station Exit 10
Tel +82-2-591-0100 · editionprs@gmail.com
Consultation hours: Monday to Friday 10:00–19:00 · Saturday 10:00–17:00 · closed Sundays and public holidays
Disclaimer
Individual results may vary. Bleeding, infection, swelling, asymmetry, and scarring can occur. Please decide after a full consultation with a board-certified specialist.
This page is general medical information. It is not a diagnosis, and it does not promise a particular outcome. Surgical fees are given after an in-person consultation.