Which condition is marked by a disturbance of equilibrium?

The condition marked by a disturbance of equilibrium is vertigo. Vertigo is characterized by a false sensation of movement or spinning, often occurring when there is an issue with the vestibular system, which is responsible for maintaining balance and spatial orientation. People experiencing vertigo may feel as though they or their surroundings are moving, leading to difficulties in balance and stability.

The other conditions presented do not specifically relate to equilibrium disturbances. Amnesia involves issues with memory, tinnitus is the perception of noise or ringing in the ears, and otalgia refers to ear pain. While these conditions can be associated with the ear and auditory system, they do not directly impact one's sense of balance as vertigo does. Understanding the unique features of each condition helps in distinguishing them from one another, especially in the context of medical coding and diagnosis.