Are You "Just Tired" or Is It Chronic Fatigue Syndrome? Everything You Need to Know

Medically Reviewed by Carolin Schneider, MD

Photo Courtesy: Malte Mueller/Getty Images

Chronic fatigue syndrome (CFS), which is also called myalgic encephalomyelitis, is a complex disorder of several organ systems. Although the cause is currently unknown, it's clearly a debilitating condition that interferes rather severely with an individual’s ability to function and complete daily activities, namely because individuals with chronic fatigue syndrome may experience long-lasting tiredness.

Individuals living with chronic fatigue syndrome often spend hours a day sleeping because they are too weak and exhausted to complete so-called "simple" tasks. In fact, even after extended periods of rest, the severity of the condition does not necessarily lessen.