EMST in Patients Undergoing CRT for HNCA

This trial is testing whether breathing exercises using a pressure threshold device (EMST150) during chemoradiation for head and neck cancer can prevent swallowing difficulties — a common and serious side effect of this treatment. **You may be eligible if...** - You have a new diagnosis of cancer in the mouth, throat, or voice box (larynx) - Your planned treatment is radiation therapy with or without chemotherapy (not primary surgery) - You are 18 or older and able to use the device (can hold it in your mouth and form a lip seal) **You may NOT be eligible if...** - Your primary treatment is surgery to the head and neck - You have a progressive neurological condition affecting muscle strength (e.g., ALS or Parkinson's) - You have swallowing difficulties unrelated to your cancer - You have had prior head and neck radiation Talk to your doctor to see if this trial is right for you.