Which is a contraindication to deep heating modalities?

• A. Chronic, non-inflammatory condition
• B. Normal sensation
• C. Acute injury or inflammation
• D. Healed scar

Answer: (C)

Deep heating modalities work by increasing tissue temperature, which boosts blood flow, metabolic activity, and tissue extensibility. In the acute phase after an injury or during active inflammation, these effects can worsen edema, increase inflammatory mediators, and exacerbate pain or tissue damage. That’s why an acute injury or inflammation is a contraindication to deep heating. In contrast, heating is generally beneficial for chronic, non-inflammatory conditions to help reduce stiffness and muscle spasm, normal sensation allows the patient to report uncomfortable heat, and a healed scar is not inherently unsafe to heat. The guideline is to avoid heating when the body is actively inflamed and needs protection from additional stress.