Which of the following is a contraindication for ultrasound?

• A. Eyes
• B. Hair loss on scalp
• C. Mild muscle soreness
• D. Regular exercise

Answer: (A)

Ultrasound energy can heat and mechanically affect tissues, so areas that are highly sensitive to even small energy exposures are avoided. The eyes are extremely delicate, with structures like the cornea, lens, and retina that can be damaged by thermal or mechanical effects, and there’s also risk of pressure changes inside the eye. Because of this, applying ultrasound directly to the eyes is a contraindication.

Hair loss on the scalp isn’t a contraindication—ultrasound can be used over the scalp with proper coupling if clinically appropriate. Mild muscle soreness isn’t a contraindication either; it’s a common symptom that may respond to therapy. Regular exercise has no relation to ultrasound safety and isn’t a contraindication.