Thermal ultrasound and chronic pain: which statement is true?

• A. Thermal US helps with chronic pain
• B. Thermal US worsens chronic pain
• C. Thermal US has no effect on chronic pain
• D. Thermal US causes permanent tissue damage

Answer: (A)

Thermal ultrasound works by raising tissue temperature to create deeper heating, which can relieve chronic pain by reducing muscle guarding and joint stiffness, improving blood flow, and enhancing tissue extensibility. When tissues are warmed, it's easier for patients to move and for therapy to be effective, and the analgesic effect often comes from a combination of increased circulation, relaxation of tight muscles, and modulation of pain signals. Using appropriate intensity, duration, and coupling keeps the heating within safe limits, minimizing risk of tissue damage.

So, the statement that thermal ultrasound helps with chronic pain reflects its practical effect: it can decrease pain and improve function in many chronic pain cases when applied correctly.