From Expert System: Chronic Fatigue
Patients with severe or persistent complaints of fatigue with or without weakness or exhaustion constitute a most important group medically, because their symptom is secondary to illness of almost any type or cause. Sometimes the complaint of fatigue precedes more specific signs or symptoms and calls for further medical investigation.
The majority of patients with chronic conditions such as cancer, heart, kidney, liver, metabolic conditions or other types of organ failure, infection, AIDS, lung disease, arthritis or almost any other medical condition usually complain of chronic fatigue at some point in their illness, along with other complaints. The outlook in these patients, obviously, depends on the nature and extent of disease and the effectiveness of treatment.
Patients with various neurologic diseases, especially multiple sclerosis, Parkinsonism, and post stroke patients may complain of chronic fatigue as a primary complaint.