Chronic fatigue

Chronic fatigue (CF) is a symptom of many diseases, illnesses and medications. It means the patient experiences significant and long-term fatigue. It should be distinguished from the disease called chronic fatigue syndrome (CFS), of which chronic fatigue is only one of many symptoms. The two terms are not interchangeable. Wikipedia contains separate pages for each.

Chronic fatigue vs. Chronic fatigue syndrome
Verywell FMS/ME/CFS has a written on the difference between CF and CFS in the article Chronic Fatigue Versus Chronic Fatigue Syndrome - What's the Difference?

Dr. Jarred Younger explains Chronic fatigue and begins by stating "Fatigue is not a disease and it is not even a symptom. So fatigue is a alarm system and the most general alarm system the body has." Webinar with Jarred Younger, Ph.D. (@6:04-7:54)

Examples of incorrect usage
In these examples the disease chronic fatigue syndrome is erroneously referred to using the name of only one of the many symptoms involved, chronic fatigue. Chronic fatigue is a symptom, not a disease.
 * Feb, 2016, How the hell of chronic fatigue drives sufferers to suicide: Those battling condition are SIX times more likely to take their own lives
 * Feb, 2015, Chronic fatigue IS 'a real and serious disease': Doctors draw up new guidelines on how to diagnose the condition

Notable studies

 * 2018, Association of sleep disorders, chronic pain, and fatigue with survival in patients with chronic kidney disease: A meta-analysis of clinical trials

Learn more

 * Wikipedia - Fatigue (chronic fatigue)
 * Wikipedia - Chronic fatigue syndrome
 * Jun 21, 2014, ME/CFS Diagnosis and Name with Dr. Nancy Klimas