Thoracic outlet syndrome is a rare condition that occurs when the blood vessels or nerves in the space between the collarbone and first rib become compressed. This can cause a variety of symptoms, including pain in the neck and shoulders, numbness or tingling in the arms and hands, and weakness in the hands.

DeGeneres explained that she initially experienced the symptoms while hosting her talk show. She thought that she had pulled a muscle in her neck, but the pain persisted and eventually became unbearable. She consulted a doctor and was diagnosed with thoracic outlet syndrome.

The condition can be caused by a variety of factors, including physical trauma, poor posture, and repetitive motions.

In some cases, it may be congenital and present from birth. Treatment typically involves physical therapy, pain management, and in severe cases, surgery.