Cryotherapy (Liquid Nitrogen)
Liquid nitrogen sprayed straight onto the skin. The white plume is the freeze itself — it lasts seconds, and the spot blisters over the following days.
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Cryotherapy vs CoolSculpting
Cryotherapy is not a fat treatment. It is two to three minutes in a chamber of very cold air, sold for recovery and soreness. CoolSculpting thins one pinchable pocket of fat. It holds a single bulge inside a cooled cup for 35 to 60 minutes. Neither one is a weight-loss treatment.
At a glance
| The difference | Cryotherapy (Liquid Nitrogen) | CoolSculpting |
|---|---|---|
| Cost | Sold as memberships, with no set end | Paid per cycle, not per session |
CoolSculpting
The applicator draws a fold of skin and fat up into the cup and holds it there while it chills. That suction is why the area feels tugged for the first few minutes.
Side by side
The differences that matter
What you actually do
Cryotherapy (Liquid Nitrogen)
Two or three minutes in a cold booth
You stand in a booth of very cold air or nitrogen vapour. It is sold for recovery, soreness and wellness, and in many places for slimming.
CoolSculpting
A cooled cup held on one bulge
The tissue is drawn into a cup and held at a set temperature for 35 to 60 minutes. One area, one bulge, one timed cycle.
Conditions treated
Cryotherapy (Liquid Nitrogen)
Sun Spots (Solar Lentigines)
A few seconds of liquid nitrogen on each spot, done in the room, no anesthetic needed. The spot darkens, crusts and lifts off over one to two weeks. It suits a small number of spots rather than a whole hand, and its known cost is a permanent pale mark where too many pigment cells were destroyed, which is a bigger risk on medium and deeper skin tones.
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Plantar Warts
Freezing in clinic, repeated every two to three weeks. Over several months the results are broadly similar to salicylic acid used properly, so it is one reasonable option rather than the top of a ladder. On the sole it is more painful than elsewhere, walking is sore for a day or two, and it works far better if the callus is pared first.
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Warts
Liquid nitrogen freezes the infected skin and the injury also draws immune attention to the spot. It needs repeating every two to four weeks, usually three or four times, and a wart regrowing from the edge between sessions is normal rather than failure. Over several months its results are broadly similar to salicylic acid used properly. It stings, it blisters, and on deeper skin tones it can leave a lasting pale or dark mark.
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Actinic Keratosis
Freezing with liquid nitrogen is the quickest option for a handful of separate patches, done in a few seconds each with no prescription. It stings sharply, then blisters or crusts and heals over one to three weeks. Its limit is that it only treats what can be seen, so new patches keep arriving from the damaged skin around them. It often leaves a permanently pale mark, which is more noticeable on deeper skin tones — worth asking about before you start.
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Keloids
Freezing can soften and flatten smaller keloids, and is sometimes used just before an injection to make the scar easier to inject. The problem is that freezing destroys pigment cells and often leaves a permanent white patch. On deeper skin tones, where most keloids occur, many dermatologists use it cautiously or not at all.
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Molluscum Contagiosum
Each bump is frozen for a few seconds, and it usually takes several visits a few weeks apart. It works, and it is quick. It also stings sharply at the time, which most young children will not sit through twice, and it leaves dark or pale marks more readily than the other options — a real consideration on deeper skin tones, where those marks can last longer than the infection would have.
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Skin Tags
A few seconds of liquid nitrogen freezes the tag so it drops off over a week or so, and it is quick when there are many. It is less predictable with pigment, because the pigment-producing cells are sensitive to cold, so it is used more cautiously on deeper skin tones and near the eyes. It destroys the tag, so nothing can be examined afterward.
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Basal Cell Carcinoma
Freezing is quick and occasionally used for small superficial tumors when other options do not suit. Nothing is checked under a microscope, so an incompletely treated tumor can carry on growing under a healed surface. It also leaves a permanent pale patch, which is much more noticeable on deeper skin tones.
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Squamous Cell Carcinoma
A quick freeze in clinic, used for actinic keratoses and occasionally for a small patch of carcinoma in situ. It is a treatment for the step before this cancer, not for the cancer itself. Freezing an invasive tumor leaves cells behind at depth and hides what is happening under a healing crust.
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How it works
Cryotherapy (Liquid Nitrogen)
Fast surface cooling, then rewarming
The cold sets off a whole-body response. Blood vessels narrow, then widen. It is not built to cool the fat under your skin enough to kill fat cells.
CoolSculpting
Steady cooling that injures fat cells
Fat crystallises and inflames at temperatures the nearby skin, nerve and muscle can take. The cells die over days. The body clears them over months.
How it works, illustrated
Cryotherapy (Liquid Nitrogen)
What you can expect to see
Cryotherapy (Liquid Nitrogen)
Feeling better afterwards
The published work sits in sports recovery, joint disease and inflammation. Studies touching obesity measured markers in the blood, not fat thickness.
CoolSculpting
A thinner fat layer at one spot
FDA pooled 4,792 cryolipolysis treatments. On ultrasound, the fat layer dropped 20.6% on average, or 3.9 mm.
What it will not do
Cryotherapy (Liquid Nitrogen)
It will not slim you
No study has ever reported a thinner fat layer after whole-body cryotherapy.
CoolSculpting
It will not change your overall size
Not loose skin, not cellulite, not overall size. It thins one defined, pinchable pocket.
How long before you see anything
Cryotherapy (Liquid Nitrogen)
However you feel walking out
Whatever that is worth, it is not a contouring result.
CoolSculpting
About three months
The fat cells die over days and the body clears them over months. The change arrives slowly.
The downside
Cryotherapy (Liquid Nitrogen)
Named hazards, and they hit at once
FDA lists asphyxiation, above all where liquid nitrogen is used for cooling. It also lists low blood oxygen, loss of consciousness, frostbite, burns and eye injury.
CoolSculpting
Numb, firm and often sore for days
A review of 554 procedures found that pain starting a few days later was not uncommon, lasting 3 to 11 days. Numbness can run past 12 weeks. Months later, a firm lump can appear.
Cost
Cryotherapy (Liquid Nitrogen)
Sold as memberships, with no set end
It is repeated indefinitely rather than bought as a course, so the spending has no natural end point.
CoolSculpting
Paid per cycle, not per session
One practice reviewed 18,203 cycles. The median was 4 cycles per patient. Budget for the cycles, not the appointment.
The at-home or drugstore version
Cryotherapy (Liquid Nitrogen)
Cold plunges and cold showers
An ice bath is the same kind of thing as the booth: a short, general cold exposure, with nothing aimed at a fat layer.
CoolSculpting
Fat-freezing belts and gel wraps
A wrap cannot hold tissue at a set temperature the way the clinic device does, and nothing shuts it off if the skin gets too cold.
Who tends to be happy with it
Cryotherapy (Liquid Nitrogen)
- Best for — Someone using it for how they feel afterwards: training recovery, soreness, the ritual of it.
- The mindset — A wellness purchase, judged on how it feels, not on what it changes.
CoolSculpting
- Best for — Someone near a stable weight with one defined bulge and firm skin over it.
- The mindset — One area at a time, a small measured change, and three months of waiting.
Why three minutes cannot do what thirty-five minutes does
Cryotherapy (Liquid Nitrogen)
A cryotherapy chamber does the opposite. The exposure is brief. It is to air, not to a cooled surface. It is spread over the whole body. And it ends before deep tissue has cooled much. No trial has compared the two, and no study has ever found a thinner fat layer after whole-body cryotherapy.
The lump that can appear months later
CoolSculpting
This risk belongs to CoolSculpting, not to the chamber. Paradoxical adipose hyperplasia is a firm, clearly edged, usually painless swelling of a treated area. The fat ends up bigger than it started. It shows up two to six months after treatment, and it does not clear up on its own.
Before you book
Cryotherapy (Liquid Nitrogen)
For a cryotherapy chamber, ask what is used for cooling and whether you are ever left alone in the room. FDA's named hazards start with asphyxiation, above all where liquid nitrogen is the coolant.
CoolSculpting
For CoolSculpting, three blood conditions rule it out. They are cryoglobulinaemia, cold agglutinin disease and paroxysmal cold haemoglobinuria. In all three, cold destroys red blood cells.
The fine print
Cryotherapy (Liquid Nitrogen)
No whole-body cryotherapy device has been cleared or approved. In a 2016 Consumer Update, FDA stated that "not a single WBC device has been cleared or approved by the agency in support of these claims",. It also said it had found very little evidence on safety or effectiveness. The claims it named ran beyond slimming, including asthma, chronic pain and insomnia. This is about the legal status of the devices, not a ruling that cold does nothing.
CoolSculpting
CoolSculpting's claim is narrow, named and cleared. The device category was created by a De Novo authorisation, DEN090002, decided 24 August 2010. Each body area since has been added by a separate 510(k) — a finding that a device is much the same as one already on sale, not a finding that it works. CoolSculpting Elite is K212707, cleared 5 November 2021.
Common questions
Questions Patients Ask
Does cryotherapy burn fat?
No published study has measured a reduction in a fat layer after whole-body cryotherapy. FDA named weight loss as one of the claims made for these chambers that it found unsupported, in a Consumer Update published on 5 July 2016. What the literature does cover is recovery, soreness, inflammation and circulating metabolic markers.
Is cryotherapy FDA approved?
No. In that same 2016 Consumer Update the agency stated that "not a single WBC device has been cleared or approved by the agency in support of these claims". An FDA medical officer was asked whether the agency had found the treatment safe and effective. The answer was: "That is not the case."
Is localised cryotherapy the same as CoolSculpting?
No. Localised cryotherapy blows cold air at an area for a few minutes. CoolSculpting draws tissue into a cup and holds it at a target temperature for 35 to 60 minutes, with the temperature controlled to within half a degree. The cleared cryolipolysis evidence all comes from that second kind of exposure.
Why does the length of the session matter so much?
Because the effect depends on temperature and time together. The founding animal work used 10 minutes at minus 1 to minus 7 degrees; the cleared human protocols are 60 minutes at minus 10 degrees under the chin and 35 minutes at minus 11 degrees on the arm. A two-to-three-minute whole-body exposure does not put subcutaneous fat anywhere near that combination.
Is whole-body cryotherapy dangerous?
FDA named specific hazards: asphyxiation, especially where liquid nitrogen is used for cooling, along with hypoxia and loss of consciousness, frostbite, burns and eye injury. A case of reversible cerebral vasoconstriction syndrome triggered by whole-body cryotherapy in a teenager has been reported. Ask what the coolant is and whether anyone is supervising.
Can I do both?
Nothing stops you, and they do not target the same thing, so there is no conflict in principle. No study has looked at combining them. If you are having cryolipolysis, tell whoever is treating you about any cold sensitivity condition first - that applies to both.
Will CoolSculpting make me lose weight instead?
No. FDA states that non-invasive body contouring will not produce weight loss, and the maker's own safety information says the procedure is not a weight-loss treatment. A pooled analysis of cryolipolysis studies found no significant weight change. What is measured is a thinner fat layer at one treated spot.
Safety to keep in mind
Neither of these is a weight-loss treatment. FDA says non-invasive body contouring "will not result in weight loss".