What are some symptoms of chronic fatigue syndrome?

Symptoms of chronic fatigue syndrome include extreme fatigue, loss of memory or inability to concentrate, sleep problems, enlarged lymph nodes in the neck or armpits and unexplained muscle pain, according Mayo Clinic. Other symptoms include new patterns and severity of headaches and sore throat.

Although the causes of chronic fatigue syndrome are unknown, patients who were born with a predisposition for the disorder may be affected by several factors, such as viral infections, immune system problems and hormonal imbalances, explains Mayo Clinic.

Chronic fatigue syndrome is a medical disorder that is characterized by fatigue that is so extreme that afflicted individuals are unable to function normally and complete regular daily activities, notes to WebMD.