Which of the following best describes chronic fatigue syndrome?

• A. A disorder characterized by persistent, unexplained fatigue lasting at least six months that is not substantially alleviated by rest and is accompanied by other symptoms such as memory problems and muscle pain.
• B. A mood disorder marked by periods of elevated or irritable mood, increased energy, and decreased need for sleep.
• C. A personality disorder characterized by a pervasive pattern of disregard for the rights of others.
• D. A psychotic disorder involving delusions, hallucinations, and disorganized thinking.

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the key term 'chronic fatigue syndrome' (CFS) by focusing on its defining characteristics in psychology and medicine.
2. Step 2: Identify that CFS is primarily characterized by persistent and unexplained fatigue lasting for a significant duration, typically at least six months.
3. Step 3: Note that this fatigue is not substantially relieved by rest, which differentiates it from normal tiredness or fatigue due to temporary causes.
4. Step 4: Recognize that CFS is often accompanied by additional symptoms such as memory problems (cognitive difficulties) and muscle pain, which are important diagnostic features.
5. Step 5: Compare these features with the other options provided, which describe different psychological disorders (mood disorder, personality disorder, psychotic disorder), to confirm that the first description best matches chronic fatigue syndrome.