Fatigue diseases are medical conditions that are characterized by extreme tiredness, exhaustion and lack of energy. There are several synonyms for fatigue diseases which refer to different types of illnesses that manifest similar symptoms. These synonyms include chronic fatigue syndrome, myalgic encephalomyelitis, post-viral fatigue syndrome, adrenal fatigue and burnout syndrome. Each of these conditions has its own distinct causes and may require different treatment approaches. Fatigue diseases can impact a person's quality of life and can be debilitating in some cases. It is important to seek medical attention if one experiences persistent fatigue or exhaustion as they may be indicative of an underlying health issue.