Which of the following is NOT a symptom of nervous system diseases or disorders?

• A. Shaking or trembling
• B. Difficulty swallowing
• C. Improved memory
• D. Changes in vision or hearing

Answer: (C)

Improved memory is not typically associated with symptoms of nervous system diseases or disorders. In fact, many nervous system disorders can lead to cognitive decline, memory loss, or difficulties with concentration. Conditions such as dementia, Alzheimer's disease, or brain injuries often manifest with impaired memory or other cognitive functions. In contrast, symptoms like shaking or trembling, difficulty swallowing, and changes in vision or hearing are common manifestations of various nervous system issues. These symptoms may indicate problems with coordination, muscular control, or neural pathways, which are directly tied to the functionality of the nervous system. Therefore, improved memory stands out as an anomaly among these symptoms, reinforcing why it is the correct answer to the question.