1.Fatigue that is persistent, relapsing or debilitating; does not improve with bed rest; and reduces or impairs average daily activity level by more than 50 percent for a period of at least 6 months (No previous history of  fatigue)

2. The patient has 4 or more of the following symptoms, which must persist or  have recurred during 6 or more consecutive months and predated the fatigue:

• Short-term memory or concentration problems
• Sore throat
• Multi-joint pain without joint swelling or redness
• Muscle pain
• Headaches of a new type, pattern or severity
• Non-refreshing sleep
• Post-exertional malaise lasting more than 24 hours

In addition, these minor symptoms may also appear:

• Poor sleep
• Achiness
• Brain fog
• Increased thirst
• Bowel disorders
• Recurrent infections
• Exhausting after minimal exertion

This should not be thought of as final guidelines in diagnosing Chronic Fatigue Syndrome. Research has shown the people with disabling fatigue who fit the Chronic Fatigue Syndrome criteria have the same immunologic changes and responses to treatment as those who don't fit the criteria. So check with your doctor!!