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App-Based ACT Intervention Shows Preliminary Benefit for Hwa-byung SymptomsNew App Helps Release Suppressed Anger and Improve Mental Health

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Key Takeaway
Consider that an app-based ACT intervention shows preliminary promise for Hwa-byung, but results are limited by lack of a control group.

This pilot feasibility trial evaluated a 4-week app-based acceptance and commitment therapy (ACT) intervention (Hwa-free) in 30 adults aged 19-80 years diagnosed with Hwa-byung. The study had no control group. Primary outcomes focused on user experience (UX) via a 22-item survey at Week 4; secondary outcomes included HB-related symptom scales, depression, anxiety, anger expression, psychological flexibility, health-related quality of life, and heart rate variability. Follow-up occurred at baseline, Week 2, Week 4, and Week 8.

Adherence was 71.2% over 28 days (mean app use 19.9 ± 7.9 days). Positive UX response rates exceeded 80% for video content (82.8-89.7%), HB self-assessment (86.2%), meditation therapy (86.2%), and in-app guidance (85.7%). Pre-post improvements from baseline to Week 4 were observed: HB Symptom Scale (delta = -9.8, Cohen's d = -0.92), Beck Depression Inventory-II (delta = -13.3, d = -1.11), and State Anger (delta = -7.8, d = -0.96). The HB screening-positive rate declined from 100% at baseline to 55.6% at Week 8. Overall, 11 of 18 clinical scales showed improvement.

Adverse events were infrequent and unrelated to the intervention; 2 participants discontinued (30 enrolled, 28 modified intention-to-treat). Tolerability was acceptable based on UX. Key limitations include the pilot design, lack of a control group, and the need for a future randomized controlled trial. Funding and conflicts were not reported.

For clinicians, these preliminary findings suggest that a digital ACT intervention may offer clinically meaningful improvements in Hwa-byung-related symptoms, but causal conclusions cannot be drawn due to the uncontrolled design. Further research is warranted.

The Hidden Cost of Holding Back

In some cultures, this specific feeling has a name. It is called Hwa-byung. It happens when anger is kept inside for too long.

This often leads to pain in the body and sadness in the heart. Many people suffer without knowing why they feel this way.

Current treatments often focus on medicine or office visits. But not everyone can get to a clinic easily.

A Shift in How We Heal

Doctors usually prescribe pills or weekly talk sessions. These work well for many, but they take time and money.

Now, scientists are testing a phone app instead. It uses a method called Acceptance and Commitment Therapy.

But here is the twist. This app is designed specifically for this hidden anger problem.

Untangling the Knot Inside

Think of your emotions like a traffic jam. You cannot force the cars to move faster.

Instead, you learn to let them pass without crashing. The app teaches you to accept feelings without fighting them.

It guides users through videos and meditation to calm the mind.

Who Took Part in the Test

Researchers asked 30 adults to use the app for four weeks. The app is called Hwa-free.

They checked how the users felt at the start and after two months. Everyone had to be diagnosed with the condition first.

Real Changes in Real People

Most people used the app almost every day. They liked the videos and the guidance.

This doesn’t mean this treatment is available yet.

After four weeks, many reported feeling much better. Depression scores dropped significantly. Anger levels went down too.

More than half of the participants no longer met the criteria for the condition by the end.

Where This Fits in Medicine

Experts say digital tools are becoming a key part of care. They offer help when you need it most.

This study shows the app is safe and easy to use. It proves the idea works in a small group.

Can You Use This Today?

You cannot download this app right now. It is still in the research phase.

If you feel this way, talk to a mental health professional. They can suggest proven treatments.

Why We Need More Proof

The group was small and only included people who already had the diagnosis.

We do not know if it works as well as standard therapy yet.

What Scientists Plan to Do Next

Scientists plan to run a larger trial to confirm these results.

Approval for public use takes time to ensure safety and effectiveness for everyone.

Study Details

Study typeRct
EvidenceLevel 2
PublishedApr 2026
View Original Abstract ↓
Background: Hwa-byung (HB) is a Korean culture-bound syndrome characterised by prolonged suppression of anger and somatic complaints. No evidence-based digital therapeutic (DTx) has been developed for HB. We evaluated the feasibility, user experience (UX), and preliminary clinical effect of an acceptance and commitment therapy (ACT)-based DTx application, Hwa-free, for HB. Methods: Adults aged 19-80 years diagnosed with HB were enrolled in a four-week app-based intervention with assessment at baseline (Week 0), Week 2, Week 4, and Week 8 follow-up. The primary outcome was UX assessed via a 22-item survey at Week 4. Secondary outcomes included HB-related symptom and personality scales, depression, anxiety, anger expression, psychological flexibility, health-related quality of life, and heart rate variability. Results: Of 45 screened, 30 were enrolled and 28 constituted the modified intention-to-treat population. Mean app use was 19.9 +/- 7.9 days (71.2% adherence over 28 days). Adverse events were infrequent and unrelated to the intervention. Positive response rates exceeded 80% for video content (items 2-4: 82.8-89.7%), HB self-assessment (86.2%), meditation therapy (86.2%), and in-app guidance (85.7%). Pre-post improvements from baseline to Week 4 were observed in 11 of 18 clinical scales, including HB Symptom Scale (delta = -9.8, Cohen's d = -0.92), Beck Depression Inventory-II (delta = -13.3, d = -1.11), and state anger (delta = -7.8, d = -0.96). The HB screening-positive rate declined from 100% at baseline to 55.6% at Week 8. Conclusions: Hwa-free demonstrated adequate feasibility, acceptable UX, and preliminary evidence of clinically meaningful improvement in HB-related symptoms. Future randomised controlled trial is warranted.
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