Chronic Fatigue Syndrome (CFS) is the medical name for a condition of extreme and persistent fatigue. To have a diagnosis of chronic fatigue syndrome (CFS), a patient must meet the following two criteria: 1) have severe chronic fatigue for 6 months or longer with other known medical conditions excluded by clinical diagnosis, and 2) at the same time, have four or more of the following symptoms: substantial impairment in short-term memory or concentration; sore throat; tender lymph nodes; muscle p...

Fever, also known as pyrexia, is a medical symptom which describes an increase in internal body temperature to levels which are above normal (37 degrees Celsius, 98.6 degrees Fahrenheit). An adaptive mechanism, fever is the body's reaction to pathogens; it attempts to raise core body temperature to levels which will denature, debilitate, or kill the pathogen. Most fevers are caused by infections and almost all infectious diseases can cause fever. ...