Background: Overweight and obesity are predominant among women of conceptive age (25–34 years) with 42% having a BMI more than 25 kg/m². Weight gain builds the dangers of having diabetes and cardiovascular disease. The amount of weight gain postpartum can shift women from the healthy weight category into the overweight or obese BMI categories. Purpose: This study was conducted to compare the effectiveness of ultra-sound Cavitation versus radiofrequency on abdominal fat thickness on postnatal women. Subjects and Methods. Fifty overweight primipara women at 6 months postnatally aged from 20-35 years, BMI (25-29.9) kg/m² and have waist hip ratio (WHR) > 0.8. They were assigned randomly into 2 equal groups: Group (A) received ultra-sound cavitation 40 KHz applied for 30 minutes, once time weekly for 8 weeks. Group (B) received radiofrequency multi-polar (1 MHZ) applied for 30 minutes, once time weekly for 8 weeks. Both groups got a similar diet program all through the treatment period. All females in both groups were assessed through weight scale for body weight, tape measurement for waist/hip ratio and ultra-sonography for fat thickness of the abdominal area pre and post treatment program. Results: showed that there was a significant reduction of body weight, abdominal fat thickness at three level (at the umbilicus level, above and below umbilicus by 5 cm) in both groups with favorable results for group A. With a significant reduction of waist/hip ratio in group A only. Conclusion: Ultrasound cavitation and radiofrequency are effective strategies for the treatment of abdominal obesity, however US cavitation are more effective than RF in reduction of WHR and abdominal fat thickness in abdominal obese in postnatal ladies.

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