MedicalTerminology DB
Symptoms, Signs & Side Effects

chronic fatigue syndrome

Meaning of chronic fatigue syndrome: A condition lasting for more than 6 months in which a person feels tired most of the time and may have trouble concentrating and carrying out daily activities.

Definition of chronic fatigue syndrome

A condition lasting for more than 6 months in which a person feels tired most of the time and may have trouble concentrating and carrying out daily activities. Other symptoms include sore throat, fever, muscle weakness, headache, and joint pain. Also called CFS.

Written and maintained by James Murray Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.