Table 1.

Diagnosis CDC-1994 criteria

Chronic fatigue syndrome symptoms
A. Major criteria (both criteria required)
1. Severe fatigue >6 months
a. Persistent or relapsing in course
b. Does not resolve with bed rest
c. Significant reduction in average daily activity (below 50 % of prior activity)
2. Other causes excluded
a. See fatigue causes
B. Minor criteria (4 or more present for 6 months)
1. Headache
a. New type, severity or pattern
b. Typically non-focal headache
2. Migratory polyarthralgias
a. Non-inflammatory (no swelling or erythema)
3. Myalgias
4. Postexertional malaise or fatigue
a. Duration >24 h
5. Short-term memory or concentration impaired
6. Pharyngitis
7. Tender cervical or axillary adenopathy
8. Non-restorative sleep