“Doctor, will the Phoenix Radio treatment hurt? I heard people say it’s like getting an electric shock—so painful that some even cried.” I’ve heard this question in my clinic more than a dozen times. Zhiqing (a pseudonym) is one of them. She started using Phoenix Radio treatment through a friend and delayed making an appointment for two whole years, all because she heard too many rumors about how painful it was. Straight answer: It varies from person to person, but the current Thermage FLX comes equipped with an instant cooling system and adjustable energy settings. Most people describe it as a “burning sensation” rather than pain. The use of an anesthetic cream along with gradual adjustment can significantly reduce discomfort, so there’s no need to hold back due to fear of pain.

Let’s start with the treatment mechanism.

To understand this issue, we first need to grasp how it works. Thermage FLX uses monopolar RF to heat the dermal layer, targeting an ONDO of around 67 degrees Celsius to stimulate the reorganization of Collagen and elastin. According toWikipedia’s entry on ThermageThis heating process itself causes a brief burning sensation on the skin, which is a normal reaction to radiofrequency therapy and does not indicate a problem with the device.

However, modern models (including the FLX series) now come equipped with instant cooling probes that cool the epidermis while heating, reducing irritation to the skin’s surface. This helps direct pain sensation to deeper tissues without damaging the epidermis.

Why did Phoenix Radio once give people an “unpleasant” impression?

Many people’s fear of Phoenix Radio actually stems from older models or unprofessional operation methods. Common causes include:

• The energy was adjusted too quicklyBeginners or inexperienced practitioners might use high energy levels from the start in an attempt to achieve quick results, without giving the skin time to adjust.
• No anesthetic ointment was usedSome clinics skip the step of applying an anesthetic cream to save time, which only increases the pain.
• Older models have weaker cooling performance.Early RF devices had cooling systems that weren’t as advanced as today’s, causing the skin to feel burning easily.
• Variations in individual pain sensitivityEveryone’s tolerance for ONDO and pressure varies naturally—what’s considered OKAY for some may seem too high for others at the same energy level.

Once you understand these factors, you’ll realize that it largely depends on the operator’s experience and equipment settings, rather than the treatment being inherently painful.

Want to reduce discomfort? Here are some pain-relief tips you should know

If you’re worried about whether it will hurt, keep an eye on the following points:

1. Apply anesthetic ointment before treatmentGenerally, applying it for 30–45 minutes can effectively reduce surface stinging sensations.
2. Choose an experienced practitionerDoctors or therapists experienced in gradually adjusting energy levels will start with low intensity and slowly increase it to the target level, thereby reducing sudden stimulation.
3. Avoid sunburn or skin irritation before treatmentDamaged skin becomes more sensitive to heat, leading to increased pain.
4. Stay in touch with the practitioner: If you feel too much pain during the treatment, feel free to ask to lower the intensity at any time — there’s no need to endure it in silence.
5. Apply ice immediately after treatment: Helps relieve burning sensations and speed up skin cooling.

Zhiqing’s Journey: From Procrastinating for Two Years to Personal Experience

Seoulcheil was first introduced to Phoenix Radio by a friend at a birthday party two years ago. “My friend said it hurt so much that she cried, and I immediately gave up the idea,” she says. Over the following two years, her skin sagging worsened gradually, prompting her to reconsider this treatment, though fear still lingered in her mind.

Before proceeding with the treatment, we explained in detail to her how energy adjustment and anesthetic cream work. We also advised her to start with medium-to-low energy levels to give her skin time to adjust. After the treatment, Zhiqing said, “It was completely different from what I imagined—just warm and a slight tingling sensation, not the ‘painful to the point of crying’ feeling my friend described. Maybe the technician used too much energy that time, or perhaps no anesthetic cream was applied at all.”

This case conveys an important message: the level of pain is largely influenced by the procedure method, and one should not give up on trying this treatment altogether just because of a single negative experience.

Want to learn more about Phoenix Radio?

If you’ve overcome this concern and want to learn more about the treatment details, you can refer to the following article:

• How much signal power does a Phoenix radio need? A complete breakdown of the myths around 2026
• How long does it take for Phoenix Radio waves to show results? Complete 2026 guide to post-surgery care and timeline of effects
• Who Should Avoid Phoenix Radio Waves? Side Effects and Contraindications – Everything You Need to Know in 2026

Frequently Asked Questions

Is the pain worse than that of fat-dissolving injections?

The nature of pain from the two treatments is different, making it difficult to compare them directly. With Phoenix Radio, there’s a persistent burning sensation, while with face slimming needles, it’s a brief stinging feeling. Most people report that after applying an anesthetic cream, the discomfort from Phoenix Radio remains within an acceptable level.

Who is particularly sensitive to the pain from Phoenix Radio waves?

People with thin skin, recent sunburn, inflammation, or a lower pain threshold may experience more noticeable discomfort. It’s recommended to discuss this with the doctor in advance to adjust the energy setting before treatment.

Can I stop the treatment midway if it hurts too much?

Sure. A professional practitioner will keep an eye on your reactions throughout the process. If you feel the energy level is too high, you can always ask them to lower it—there’s no need to endure it until the treatment is over.

Can applying an anesthetic ointment completely eliminate pain?

Anesthetic ointments can effectively reduce surface pain, but they cannot eliminate heat stimulation 100%—the sensation of deep tissue heating still remains, though at a reduced intensity.

Will the skin stay painful after Phoenix radiofrequency treatment?

The burning sensation after treatment usually subsides within a few hours. Some people’s skin may experience mild redness or sensitivity, but it typically returns to normal within 1–2 days without persistent pain.