Thermal heating of ultrasound increases blood flow which assists in reduction of edema by

• A. Reduction of edema
• B. Increase in edema
• C. No effect on edema
• D. Edema worsens

Answer: (A)

Thermal ultrasound raises tissue temperature, causing vasodilation and increased local blood flow. When edema is present, excess fluid sits in the interstitial space; the boost in perfusion improves venous return and enhances lymphatic drainage, helping to clear the fluid more efficiently. The warmer tissue also lowers fluid viscosity and promotes easier fluid exchange between compartments. The net effect is a reduction in edema.