List common early signs of occupational noise-induced hearing loss and why early detection matters.

• A. Tinnitus, muffled hearing, difficulty understanding speech in noise; early detection allows intervention to prevent progression.
• B. Headache and fever unrelated to noise.
• C. Increase appetite.
• D. Improved ability to hear high-frequency sounds.

Answer: (A)

Early signs of occupational noise-induced hearing loss are tinnitus (ringing or buzzing in the ears), muffled hearing where sounds seem blurred or less clear, and difficulty understanding speech in noisy environments. These symptoms show up because loud or prolonged noise damages the hair cells in the inner ear that are responsible for coding to high-frequency sounds and processing speech in background noise. Detecting these signs early matters because once noise damage occurs, it is usually permanent. Early detection allows practical steps to prevent further loss: reducing exposure, using appropriate hearing protection, implementing noise controls at the source, and conducting baseline and periodic audiometric testing to monitor any changes. By acting early, you can slow or prevent progression and protect remaining hearing.

The other options don’t fit NIHL: headaches and fever aren’t specific to noise-related ear damage; an increased appetite isn’t related at all; and an improved ability to hear high-frequency sounds would be contrary to the usual pattern of NIHL, which tends to weaken high-frequency hearing first.