HBO therapy is generally painless. You can sit or recline comfortably during the treatment in a large glass covered chamber while resting or watching television. You will notice a sense of fullness in the ears at the beginning and end of treatment as the pressure is adjusted. This sensation is similar to that which is felt when flying in an airplane or diving underwater. You will be taught a simple technique to relieve ear pressure and avoid any discomfort. Some patients will hear a crackling noise in their ears between treatments, which can be relieved using the same technique. If the crackling noise persists, it should be reported to the staff.
Some patients may feel light-headed after treatment, which is usually very brief.