What is a common side effect after a mastoidectomy?

Dizziness, or vertigo, is a common side effect following a mastoidectomy due to its proximity to the inner ear structures. The mastoid process houses the mastoid cells that are connected to the middle ear and are very close to the vestibular apparatus, which is crucial for balance. During the surgical procedure, manipulation of the surrounding tissues and structures can disrupt the normal functioning of the vestibular system, leading to feelings of dizziness or a sensation of spinning.

While fever can occur postoperatively as part of the body’s natural response to surgery, it is not specific to mastoidectomy and can indicate infection or other complications. Tinnitus, or ringing in the ears, may also be noted but is less common directly after the surgery than dizziness. Ear drainage is possible but typically indicates complications such as infection rather than a standard side effect of the procedure. Hence, dizziness is most closely associated with the surgical effects on balance mechanisms, making it the best answer in this context.