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What is Chronic Fatigue Syndrome?

Get general information about chronic fatigue syndrome, learn the common terms associated with the frequently misunderstood condition and become familiar with the signs and symptoms of chronic fatigue syndrome.
  1. Causes & Risk Factors (5)
  2. Diagnosing ME/CFS (4)
  3. FAQs (9)

Look for Answers with the Symptom Checker

Find out what could be causing your symptoms and quickly get information about it.

XMRV & Chronic Fatigue Syndrome

In the XMRV Discovery Series, learn about XMRV and chronic fatigue syndrome, the potentially groundbreaking research that links them, what the XMRV discovery could mean to chronic fatigue syndrome treatment, diagnosis and prevention, how XMRV may be transmitted, how it may be linked to fibromyalgia and more.

What is Chronic Fatigue Syndrome?

Learn the basics of chronic fatigue syndrome, its symptoms, and what treatment options are available.

Understanding Chronic Fatigue Syndrome - A Simple Explanation

Understanding chronic fatigue syndrome is difficult. If someone in your life has this debilitating condition, you can help them a lot by understanding chronic fatigue syndrome better and relating to what they go through.

Explaining Chronic Fatigue Syndrome - Get Ideas for Explaining Chroni…

Explaining chronic fatigue syndrome to the people in our lives can be difficult. Get ideas for explaining chronic fatigue syndrome better, and share what has (or hasn't) help you explain this complicated condition.

Chronic Fatigue Syndrome Viruses & Immune-System Terms

Get an understanding of chronic fatigue syndrome viruses, immune system dysfunctions, and other important aspects of the condition.

Frequently Asked Questions About ME/CFS

Understanding chronic fatigue syndrome is difficult. Get started on the path toward understanding chronic fatigue syndrome by getting answers to common questions. Also find out how to get answers to your own questions.

Chronic Fatigue Syndrome Fact Sheet

Get the facts of chronic fatigue syndrome, including chronic fatigue syndrome symptoms, how chronic fatigue syndrome is diagnosed, and how chronic fatigue syndrome is treated.

Chronic Fatigue vs. Chronic Fatigue Syndrome

What's the difference between chronic fatigue and chronic fatigue syndrome? How are the two conditions diagnosed? What causes CF and CFS?

The 7 Genomic Subtypes of Chronic Fatigue Syndrome

Find out what symptoms go with which chronic fatigue syndrome subtypes, and why subtyping is important to both researchers and people with chronic fatigue syndrome.

In-Depth Information on Chronic Fatigue Syndrome

Get comprehensive information on chronic fatigue syndrome, including risk factors, psychological factors and other commonly occurring conditions.

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