Can ONDA Lift Slim the Upper Arms? A Clinic Explains the Number of Sessions and Cost for Results

The benefits expected from ONDA Lift for the upper arms are slimmer contours through fat reduction and improvement of hanging loose skin through skin tightening. Unlike treatments that target fat alone, ONDA Lift can work on both fat and skin in a single session. Let us take a closer look.

ONDA Lift delivers heat to the subcutaneous fat of the upper arms using special microwaves, reducing fat cells. Microwaves are a form of energy also used in devices such as microwave ovens. During treatment, the skin’s surface is continuously cooled, helping warm the deeper layers while limiting heat damage to the surface.

Fat cells exposed to heat are damaged and eliminated from the body over several weeks. At LIVELY CLINIC, the handpiece used for the upper arms is designed for the body and reaches deeper fat layers, unlike the handpiece used for the face.

The heat that reaches the fat also reaches the deeper layer of the skin, the dermis. As collagen contracts and new collagen is produced, loose skin gradually regains firmness. Because the skin in areas where fat has decreased is also tightened at the same time, one benefit is that it becomes easier to prevent the skin from becoming excess and sagging.

With the upper arms, skin tightening tends to appear first, while slimmer contours from fat reduction appear later. Some people may feel tightening immediately after treatment, whereas it takes time for damaged fat cells to be eliminated from the body.

Changes in slimness generally begin to be noticeable 2–4 weeks after treatment and become clear at around one month. Even if the circumference of the arms does not decrease immediately after treatment, this does not mean that the treatment has not worked.

Upper-arm size is caused by three factors: subcutaneous fat, loose skin, and muscle or swelling. ONDA Lift can be expected to work on two of these: subcutaneous fat and loose skin. The likely cause can be estimated to some extent from how the arms feel when touched.

Upper arms whose size is caused by subcutaneous fat are more likely to show slimming results with ONDA Lift. Because ONDA Lift reduces fat in specific areas, it is suitable for upper arms where fat remains around the arms even after losing weight through dietary restrictions.

However, if there is a very large amount of fat or you want to significantly reduce your size in a short period, ONDA Lift alone may not achieve your goal. Conversely, when there is only a thin layer of pinchable fat, heat may be less likely to reach it, and the changes may be smaller.

If the arms have little fat but the skin hangs when the arms are raised, the cause is loose skin. Tightening with ONDA Lift can help improve the contours of the arms. Because the heat from ONDA Lift also reaches the deeper layers of the skin, there is no need to receive separate treatments for fat reduction and skin tightening.

However, when there is a large amount of excess skin on the upper arms, such as after significant weight loss, tightening alone may not remove all the excess skin. Surgery to remove the skin may be considered.

Upper-arm size caused by muscle or swelling will not change with ONDA Lift. ONDA Lift works on fat and skin, but it does not reduce muscle thickness or excess fluid retained in the body. If muscle or swelling is the main cause of the size of the upper arms, identifying the cause during a consultation and then choosing a treatment can help you avoid spending money on a treatment that will not produce results.

For the upper arms, a general guideline is to continue ONDA Lift for about five sessions at approximately four-week intervals, followed by one session every 2–3 months to maintain the results. Body treatments are performed at longer intervals than facial treatments, with additional sessions scheduled while checking the progress after the previous treatment. Let us look at the details.

Because fat reduction accumulates with each session, some people begin to notice changes after the third or fourth session. However, the slimming effect can be assessed after completing five sessions. After the first session, you can tell how the heat felt during treatment and whether the skin feels tighter, but it is not yet possible to assess changes in fat. The approximate changes according to the number of sessions are as follows.

If you stop treatment after deciding that one session has had no effect, you will finish treatment before the fat reduction has had time to accumulate.

Although reduced fat cells do not return, skin tightening gradually loosens over time.

Skin tightening is generally expected to last for approximately six months to one year. If the intervals between sessions are too long, loose skin may return, so scheduling the next appointment at approximately 2–3 months can make it easier to continue treatment.

ONDA Lift treatment on the upper arms can be received without anesthesia, and redness or a sensation of heat after treatment generally subsides within several days. You can go about your usual activities immediately after treatment, although there are some activities you should avoid for about one week. We explain the pain and downtime chronologically.

Because ONDA Lift cools the surface of the skin during treatment, upper-arm treatment can also be performed without anesthesia. Rather than a sharp, needle-like pain, you will feel a gentle warmth spreading through the inner side of the arm during treatment. If the heat feels too strong, tell the practitioner during treatment so the output can be adjusted.

Redness or a sensation of heat (flushing) may appear on the upper arms after treatment. In many cases, it subsides within several hours to one day, and even when it lasts longer, it generally settles within 3–4 days. Because the upper arms can be covered with long sleeves, it is relatively easy to go out as usual even while redness remains. The skin may become more prone to dryness after treatment, so moisturizing is also essential.

For about one week after treatment, it is generally recommended to avoid activities that promote circulation and stimulation of the treatment area. The following five points provide general guidelines for aftercare.

You should also avoid activities that strongly rub or scratch the treated upper arms during the same period.

ONDA Lift is not available to people who are pregnant or breastfeeding, or who have metal or a medical device in the treatment area. People with heart disease, those who use a pacemaker, and those with medical conditions such as skin disease, severe allergies, diabetes, or autoimmune disease are also not eligible for treatment. This includes cases in which a metal plate has been placed in the arm during fracture treatment. Anyone to whom these conditions apply should inform the clinic at the time of booking.

In addition to ONDA Lift, options for spot slimming of the upper arms include Full body liposuction, fat freezing, and Fat-Dissolving Injection. A major difference is whether the treatment can also target skin tightening at the same time. The most suitable treatment depends on the amount of fat and how much downtime you can take. We explain the differences in detail.

The types of upper arms suited to each of the four treatments and how to spend time after treatment are as follows.

Full body liposuction is the treatment that can significantly reduce size in a single session, while the other three treatments gradually slim the arms over multiple sessions. During your consultation, you and the physician will determine the appropriate option by considering whether you can take downtime and how much you want to slim the arms.

A point that is often overlooked is that reducing fat alone may leave excess skin unsupported, making hanging loose skin more noticeable. Fat freezing and Fat-Dissolving Injection are treatments intended to reduce fat, and they do not have a substantial skin-tightening effect.

If loose skin is also a concern on the upper arms, ONDA Lift may be considered as an option because it works on fat and skin at the same time.

If there is a large amount of pinchable fat and you want to significantly reduce your size in a single session, Full body liposuction may be more suited to your goal than ONDA Lift. Because ONDA Lift gradually slims the arms over multiple sessions, upper arms with a large amount of fat may take time to reach the desired size.

On the other hand, if you are unable to take downtime for swelling or compression garments, choosing to gradually slim the arms with ONDA Lift may be an option.

At LIVELY CLINIC, we invited Dr. Federica, a globally recognized KOL (a physician with influence as an expert) in ONDA Lift (ONDA PRO) from its home country of Italy. Our physicians and staff received lectures and hands-on training directly from her. We apply what we learned—from treatment theory and energy settings to how to perform irradiation on each area—to our daily treatments.

Our clinic also has a physician who has presented on the effects of ONDA Lift at an academic meeting of a cosmetic surgery society. Since introducing the treatment at an early stage in Japan, we have performed more than 20,000 treatments in total (August 2024–October 2026, group total). LIVELY CLINIC will continue incorporating the latest knowledge about ONDA Lift.

We answer three questions that commonly arise when considering ONDA Lift for the upper arms.

Yes. The treatment areas for ONDA Lift Body include both upper arms, and treatment of the upper arms alone is also available. Telling us specifically during your consultation what concerns you—for example, only the outer upper arms or slimming the entire arms—makes it easier to determine the treatment area.

Reduced fat cells do not return. Unless there is a significant increase in body weight, the reduction in fat can be maintained for a long time. However, if you gain weight, the remaining fat cells may enlarge, which can make the upper arms appear thick again. Continuing to follow a diet that avoids significant weight gain both during and after treatment is a prerequisite for maintaining slimmer contours.

Yes, you can. However, strenuous exercise should be avoided for about one week after treatment, so a general guideline is to resume exercise from the week after treatment. If you receive treatment every four weeks, you can devote approximately three weeks to exercise, excluding the first week after treatment. Light arm exercises and stretching may also help maintain a toned appearance.

Whether ONDA Lift will slim the upper arms depends first on whether their size is caused by subcutaneous fat and loose skin, rather than on the number of sessions. If fat and loose skin are the cause, continue treatment for about five sessions at four-week intervals and assess the changes. If muscle or swelling is the main cause, it is important to review your lifestyle before receiving ONDA Lift.

At LIVELY CLINIC, the cause of upper-arm size is assessed through an examination and consultation before determining the number of sessions and treatment area. ONDA Lift treatment is available at the following three clinics.

Please book a consultation first at the clinic that is most convenient for you.