Which statement describes an indication for thermotherapy?

• A. Decrease tissue temperature
• B. Increase circulation and generate macrophages
• C. Decrease macrophages
• D. Decrease circulation

Answer: (B)

Thermotherapy raises tissue temperature to stimulate healing processes. By warming the tissue, heat causes vasodilation, which increases blood flow to bring more oxygen and nutrients and to remove waste products. It also boosts metabolic activity and enhances immune cell function, including macrophages, which help clear debris and support healing. That combination—more circulation and activated macrophages—fits an indication for applying heat.

The other options describe effects of cooling or reduced activity (lower temperature, reduced macrophages, or reduced circulation), which are not indications for thermotherapy.