Skip to Content
Interactive Textbook on Clinical Symptom Research Logo


Home Button

Fatigue Sections
Author Bio
Introduction
Fatigue in Medical Illness
Currently selected section: Fatigue Defined
Research Questions
Measurement and Assessment
Fatigue Measurement
Related Constructs
Designing Fatigue Surveys
Case Definition
Data Collection
Maximizing Completion
Designing Intervention Trials
Controlled Trials
Selecting Study Procedures
Issues in Data Analysis
Conclusion
Chapter 9: Fatigue: Definition and Nature of Fatigue
        

The ICD definition of cancer-related fatigue highlights the multidimensional nature of fatigue. To some extent, all symptoms can be depicted from this perspective, incorporating descriptors focused on intensity, temporal relations (e.g. fluctuation and course), and quality. The quality of fatigue, which generally has been neglected in previous research, may be particularly relevant to an understanding of the pathophysiology and management of the phenomenon. The language used by patients to describe fatigue varies, and can relate to a global lack of energy, cognitive impairment, sleepiness, muscle weakness, mood disturbance, or some combination of these descriptors.

Table 3.2: Descriptors Applied to Fatigue
Related to a Sense of Energy or Vitality Related to Cognitive Change Related to Sleep Related to Strength Related to Mood

Fatigue

Lack of energy

Lethargic

Tiredness

Exhaustion

Clouded or confused

Apathetic

Inattentive

Poor concentration

Poor memory

Somnolent or sleepy

Non-restorative sleep

Weakness

Fatiguability of muscles

Post-exertional breathlessness or
exhaustion

Irritability

Lability

Depressed

 

Page 6 of 45

Previous Page

Get Adobe Reader