For example, Frances said DSM-5 would mislabel one in four people with chronic pain and irritable bowel syndrome with the DSM-5's newly created "somatic symptom disorder, " which is diagnosed when a person has spent at least six months steadily thinking of and being anxious about their medical illness.

CNN: Are we over-diagnosing mental illness?

People with nonspecific-type thoracic outlet syndrome have chronic pain in the area of the thoracic outlet that worsens with activity, but the specific cause of the pain can't be determined.

CNN: Thoracic outlet syndrome

The researchers reported they found the retrovirus XMRV in a majority of 101 patients with chronic fatigue syndrome, a debilitating condition that involves cognitive dysfunction and severe pain.

WSJ: Chronic-Fatigue Paper Called Into Question