Procedure

CoolSculpting

A cooling applicator held against a pocket of fat long enough to kill some of the fat cells, which the body then clears over the next few months. It is body contouring, not weight loss, and each round removes only part of the fat layer in the spot treated.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
A gloved hand holding a large white cooling applicator against a woman's abdomen as she lies on a treatment bed

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The scale will not move. This is for a pocket of fat that sits there whatever you weigh — the lower belly, the flanks, the roll under a bra strap. One cycle removes a slice of the fat layer, not the pocket, roughly a fifth to a quarter of the fat in the treated spot, so most areas need two or three rounds before the change shows in a photograph. I raise paradoxical adipose hyperplasia every time, because it surprises people: months later the area gets larger and firmer instead of smaller, it does not resolve on its own, and fixing it usually means surgery.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledCryolipolysis, fat freezing, CoolSculpting Elite
DowntimeNone. Most people go back to work the same day
SessionsUsually 1 to 3 rounds per area, spaced at least 6 to 8 weeks apart
Typical costAbout $600 to $1,500 per applicator cycle in the US. Most areas need more than one applicator, so treating one area often totals $2,000 to $4,000
Results timelineFirst change around 3 to 4 weeks, most of it by 8 to 12 weeks
PainIntense cold and a strong pulling feeling for the first several minutes, then numbness. The short massage afterward is the part most people dislike
Skin tone safetyThe device cools fat and does not target pigment, so the risk of dark or light patches is low on all skin tones

What It Is

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A cup-shaped applicator sits on a pocket of fat and pulls the tissue in with gentle suction. The plate inside cools it to just above freezing for 35 to 60 minutes, depending on the applicator. Cold damages fat cells at a temperature skin, nerves and blood vessels tolerate, so the fat is injured and the surface is not. Cleared in the US for the abdomen, flanks, inner and outer thighs, under the chin and jawline, the back, around the bra line, the upper arm, and under the buttock. It is not a treatment for being overweight, and it does nothing to the deep fat around the organs — the fat that matters most for health. It does not tighten loose skin. CoolSculpting is one brand of cryolipolysis. Other machines work the same way, and results depend as much on who places the applicator as on the device.

How It Works

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Fat cells are more vulnerable to cold than the tissue around them. Cooling them to a set temperature for a set time makes them die off slowly — controlled, not a burn. Over the following weeks, macrophages — immune cells — clear away the damaged cells, and the body handles the contents through normal fat metabolism.

Because that clearing is gradual, nothing happens quickly. The fat layer thins over about two to three months. Studies generally find a reduction of roughly a fifth to a quarter of the fat layer per round — a real change on a caliper, a modest one in the mirror.

Destroyed fat cells do not grow back, which is not the same as a permanent result. The cells left behind, there and everywhere else, still get bigger if you gain weight, so the shape can change again.

What It Treats

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No strong evidence for any condition.

Pros and Cons

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Pros
  • No cuts, no anesthesia No incision, no stitches, no sedation.
  • You can go back to work Most people carry on with their day.
  • It works on stubborn pockets The lower belly, flanks and inner thighs.
  • Low pigment risk Cold, not light, so melanin is not a target.
Cons
  • The change is modest One round thins the layer. Most areas need two or three.
  • It is slow Nothing visible for a month, the final result three or four.
  • It is not weight loss Body weight does not change, and neither does health risk.
  • It does nothing for loose skin If the problem is laxity, it can look worse.
  • Paradoxical adipose hyperplasia The area grows larger months later. Needs surgery.
  • It is expensive per inch Several rounds often cost more than surgery.

What Happens

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ArrivingThe treatmentLeaving
Arriving
The area is marked while you stand, since fat moves when you lie down. Photos and measurements are taken, and the provider picks the applicator shape and the number of cycles. No numbing — the cold does that within the first few minutes. Your provider will ask about these things.
The treatment
A gel pad goes on, the applicator is placed, and suction pulls the fat in. The first two to five minutes are intense cold, aching and pulling; then it numbs and most people read through the rest of the cycle, about 35 to 60 minutes. The cup comes off leaving a firm, cold, pale block, massaged about two minutes to improve the fat lost. The massage is what people remember.
Leaving
Red, swollen, firm and numb. It looks worse for a few hours than it will tomorrow, and you can drive yourself home.

Recovery

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Days 1 to 7Days 3 to 14Weeks 2 to 8
Days 1 to 7
Bruising appears and fades over a week or two. The area can feel tender, itchy, crampy or oddly sensitive, and may look slightly fuller from swelling. Clothing and exercise are unrestricted.
Days 3 to 14
Some people get burning or shooting nerve pain starting several days after treatment. More common on the abdomen, it settles over one to three weeks. If it disturbs sleep, prescription medicines help — tell your provider rather than waiting it out.
Weeks 2 to 8
The numb patch shrinks and sensation returns over several weeks. Numbness past a couple of months is uncommon and worth reporting.

Aftercare

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Same dayA few days1 to 2 weeks
Exercise
Same day
No restriction.
Clothing
A few days
Loose waistbands after an abdomen treatment — the area is tender.
Massage
1 to 2 weeks
Some providers suggest massaging the area a few minutes daily. Evidence is thin; it does no harm.
Weight
Keep it steady. The fat cells that remain still enlarge with weight gain, which undoes the change.
Photos
Take your own at four weeks and twelve weeks, same light and position. Gradual change is hard to judge from memory.

Risks

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Most of what happens afterward is expected and temporary: redness, swelling, bruising, firmness, cramping, itching and numbness, settling over days to weeks. Nerve pain starting several days later is less common but well recognized, and it resolves.

Paradoxical adipose hyperplasia
The treated area becomes larger, firmer and well-defined instead of smaller, usually two to five months after treatment. It is uncommon, but published rates vary widely between the manufacturer's figures and independent clinics, so treat any quoted number with caution. It is reported more often in men and on the abdomen. It does not resolve on its own, more cryolipolysis does not fix it, and correcting it means liposuction or surgery once it has stopped changing. Raise it as soon as the area starts growing.
Pain that starts days later
Burning, shooting or aching nerve pain three to fourteen days after treatment. It settles over a few weeks; prescription treatment helps meanwhile.
Numbness lasting past two months
Usually resolves, but should be looked at.
Lasting firm lumps or an uneven edge
A step or ridge where the applicator sat, still there after three months.
A dark patch at the treated site
Uncommon, more noticeable on deeper skin tones. Treat early.

In Deeper Skin Tones

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This is one of the safer body treatments for deeper skin tones, because the device works with cold, not light. Lasers and intense pulsed light are absorbed by melanin, which is what makes them riskier on deeper skin. Cooling has nothing to absorb, so those pigment risks do not apply.

Dark patches at the treated site are uncommon but possible. Bruising, swelling and inflammation can leave post-inflammatory hyperpigmentation — brown marks after the skin has been irritated — and those are more visible and slower to fade on deeper skin tones. If you are prone to them, say so, keep the area out of the sun while it is bruised, and raise a new brown patch early.

Paradoxical adipose hyperplasia, delayed nerve pain and the other real risks are not related to skin tone. Neither is the size of the result, and nothing about the technique or settings needs to change.

If You Stop

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Destroyed fat cells do not grow back, so stopping does not reverse what has happened. There is no rebound and no maintenance appointment to miss.

Weight is what changes the result. The fat cells left in the treated area, and everywhere else, still enlarge if you gain weight, and a treated pocket can look much as it did before. Weight gained afterward also shows up in slightly different places, since one area now has fewer fat cells.

Stopping partway through a course: Say after one of three rounds — you keep the change from the round you had.

Combining Treatments

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Same day
Muscle-stimulating devices
Often paired, though evidence for the combination is limited.
Same day
Skin-tightening treatments
Sometimes added where there is loose skin as well as fat.
Wait 2 weeks
Treating the same area
Wait until swelling and numbness settle, a couple of weeks.
Wait 6–8 weeks
Another round
Do not repeat sooner — results take that long to judge.
Don’t combine
Deoxycholic acid
An alternative rather than a partner; rarely sensible to do both.
Ask your doctor
Liposuction
Raise planned surgery early; a surgeon may prefer an untreated area.

Insurance Coverage

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Insurance does not cover it. It is cosmetic everywhere, with no exceptions.

Ask Your Doctor

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If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy or breastfeeding first.
If you have a hernia in or near the area
Suction pulls tissue into the applicator, a bad idea over a hernia. Assess it first.
If you have a condition triggered by cold
Cryoglobulinemia, cold agglutinin disease, paroxysmal cold hemoglobinuria and severe cold urticaria rule it out. Raynaud's needs a discussion.
If you have had surgery in the area
Or mesh, or a significant scar. Scarred tissue behaves differently under suction, so the plan may change.
If you take a blood thinner
Or bruise easily. Expect more bruising, and check with the prescriber.
If you have nerve pain already
Or neuropathy. Delayed nerve pain afterward is more of a concern.
If your goal is losing weight
Wrong treatment. It changes shape in one spot, not weight or health risk.
If the problem is loose skin
Rather than a fat pocket. Removing fat under loose skin does not tighten it. Ask what is being treated.
If you are a man having this done
On the abdomen or flanks. Paradoxical adipose hyperplasia is reported more often there and in men. Ask the number your provider uses and how they would handle it.
If you are treated for an eating disorder
Speak with the clinician managing that before booking body contouring.
If you have a pacemaker
Or an implanted device in the area. Raise it so placement can be checked.

At-Home Versions

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Strength training and overall weight loss
Good alternative
Changes body composition and health, unlike anything on this page. It cannot be aimed at one spot — spot reduction through exercise does not work — which is exactly why stubborn pockets exist in the first place.
Fat-freezing wraps and belts sold online
Bad alternative
These do not reach or hold the temperature that damages fat cells, and the ones that get cold enough can cause frostbite. There is no home version of this treatment.
Waist trainers and compression
Bad alternative
Garments with no evidence for fat loss. They compress tissue temporarily and change nothing underneath. Tight ones worn for long periods are uncomfortable and can restrict breathing.
Cellulite and fat-burning creams
Bad alternative
Nothing applied to the skin reaches the fat layer in a meaningful amount. The temporary tightening some produce is superficial and lasts hours.

How It Compares

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Liposuction
Better
Removes far more fat, in one operation, with a predictable result a surgeon shapes directly. Costs more, involves anesthesia, compression garments and one to two weeks of real recovery, and carries surgical risk. It is what people are usually picturing when they book cryolipolysis.
Injectable deoxycholic acid
The same
Under the chin, where it is the main alternative. Several sessions, and swelling that is genuinely conspicuous for several days each time. Not used on large areas.
Radiofrequency body contouring
The same
Heats fat instead of cooling it, with a similarly modest result per session and usually more sessions. Some devices tighten skin a little as well, which cryolipolysis does not.
Muscle-stimulating devices
Different job
Works on the muscle underneath rather than the fat above it, so it addresses a different part of the same complaint. Usually a course of several sessions close together, with maintenance.
Prescription weight loss medication
Different job
For weight loss, and a different goal entirely. It reduces fat everywhere rather than in a chosen spot, requires ongoing treatment and medical follow-up, and does change health risk. Worth raising with a doctor if the real aim is losing weight rather than shaping one area.
Doing nothing
Different job
A reasonable option that gets skipped too often. These are pockets of ordinary fat, and leaving them alone costs nothing and risks nothing.

Finding a Provider

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No incision leads people to assume the operator does not matter. It matters a great deal. Applicator choice, placement and overlap decide whether the result is even, and a badly placed applicator leaves a visible step. In most US states a trained technician may deliver it under a physician's supervision, and rules vary by state.

Ask who marks the area and who places the applicator, how many cycles and why, and to see their own patients' before-and-after photographs at three months in the same lighting and position. Ask what they have seen when paradoxical adipose hyperplasia has occurred, and what happens financially if it happens to you — some manufacturers and practices have covered corrective surgery, terms vary, and you want that in writing.

Red flags: a quote for one cycle presented as a quote for a result, pressure to buy a large package on the first visit, before-and-after photos with different lighting or posture, unbranded machines with no service record, and a provider who says there are no risks.

Myths

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  • "It is a weight loss treatment." It is not, and the scale is the wrong way to judge it. It thins a fat layer in one spot. Body weight stays the same, and the health benefits of real weight loss do not follow.
  • "The fat comes back somewhere else." The destroyed cells are gone and do not relocate. With weight gain, fat cells everywhere get bigger, and because the treated area has fewer, extra weight shows up more elsewhere. A real effect, described inaccurately.
  • "One session gives you a flat stomach." One round removes part of the fat layer in the treated spot. Most people need two or three rounds, and someone with a substantial amount of fat will not get a flat stomach at all.
  • "It tightens the skin at the same time." It does not. Removing fat under already loose skin can make the looseness more obvious.
  • "Non-invasive means risk-free." No incision does not mean no complications. Paradoxical adipose hyperplasia, delayed nerve pain and cold injury are real, and the first usually needs surgery.
  • "It gets rid of cellulite." It does not. Cellulite comes from fibrous bands tethering the skin, not the fat above them.

Questions Patients Ask

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Will I lose weight?

No. This thins a fat layer in one spot. Your weight stays about the same. If losing weight is the goal, this is the wrong treatment — see a doctor instead.

How much fat does one session actually remove?

Studies generally report roughly a fifth to a quarter of the fat layer per round. Real and measurable, modest to look at, which is why most areas take two or three rounds.

What is paradoxical adipose hyperplasia?

The treated area gets bigger and firmer instead of smaller, usually two to five months afterward. It is uncommon, reported rates vary a lot between sources, and it is reported more often in men and on the abdomen. It does not resolve by itself, and correcting it normally requires liposuction or surgery. Your provider should raise it unprompted.

Does the fat come back?

The destroyed cells are gone permanently. The ones left still enlarge if you gain weight, so the shape can change again. Steady weight keeps the result.

Does it hurt?

The first few minutes are intensely cold and pull hard, then the area numbs. The massage afterward is uncomfortable for about two minutes. Expect tenderness and numbness rather than pain, though a minority get delayed nerve pain starting days later that settles over a few weeks.

Is it safe on deeper skin tones?

Yes. Cold, not light, so it does not target pigment, and the risk of dark or light patches is low on all skin tones. Bruising can leave a temporary brown mark, more visible on deeper skin — mention it if you are prone to that.

References

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