Chronic Fatigue Syndrome (CFS) or Systemic Exertion Intolerance Disease (SEID)

  • Medical Author:
    Charles Patrick Davis, MD, PhD

    Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.

  • Medical Editor: Jerry R. Balentine, DO, FACEP
    Jerry R. Balentine, DO, FACEP

    Jerry R. Balentine, DO, FACEP

    Dr. Balentine received his undergraduate degree from McDaniel College in Westminster, Maryland. He attended medical school at the Philadelphia College of Osteopathic Medicine graduating in1983. He completed his internship at St. Joseph's Hospital in Philadelphia and his Emergency Medicine residency at Lincoln Medical and Mental Health Center in the Bronx, where he served as chief resident.

Quick GuideChronic Fatigue Syndrome (CFS) Symptoms and Diagnosis

Chronic Fatigue Syndrome (CFS) Symptoms and Diagnosis

Is it possible to prevent CFS/SEID?

Currently, there are no known methods to prevent CFS/SEID. Development of effective prevention methods is hampered by no firm knowledge of the cause(s) of CFS/SEID. Most experts and clinicians suggestions for prevention are general recommendations that result in a healthy lifestyle since no specific prevention methods are known. Examples of the general recommendations are avoidance of viral infections, lower daily stress as much as possible, and maintain regular sleep cycles and a healthy diet, along with avoidance of the many toxins in the environment; these are cited by most clinicians as possible ways to reduce or prevent the chance of developing CFS/SEID.

Females with CFS/SEID are cautioned about pregnancy because of the stresses placed on the mother and fetus. In addition, the genetic connection, if any, is not clear between the parents with CFS/SEID and their children.

Where can people find additional information about CFS/SEID?

The following is a list of agencies and groups where people may obtain more detailed information about chronic fatigue syndrome or systemic exertion intolerance disease and how individuals cope with the disease:

CFIDS Association of America:

CDC Treatment and Management Options:


"Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness." Institute of Medicine. Feb. 10, 2015. <>.

Cunha, Burke A. "Chronic Fatigue Syndrome." Oct. 19, 2009. <>.

"Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) Key Facts." Institute of Medicine. Feb. 2015. <>.

United States. Centers for Disease Control and Prevention. "Chronic Fatigue Syndrome." Oct. 15, 2010. <>.

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