Chronic fatigue and immune dysfunction syndrome (CFIDS), also known as chronic fatigue syndrome (CFS), myalgic encephalomyelitis (ME) and by other names, is a complex and debilitating chronic illness that affects the brain and multiple body systems. On this portion of our website you can find detailed information about CFIDS, its symptoms, diagnosis, treatment, important research findings and how it affects the lives of those who live with it everyday.

Whether you are a person with CFIDS, a medical professional, a caregiver or just curious, we hope that the information you find here will improve your understanding of this devastating illness that affects more Americans than multiple sclerosis (MS), AIDS or lung cancer.

• Symptoms
• Diagnosis
• Treatment
• Research
• Prevalence
• Research Case Definition
• Patient Profiles
• Patients: Frequently Asked Questions

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