On a December morning in 2013, this Metro-North train headed towards New York City derailed in the Bronx, killing four passengers and injuring 115. The driver was later found to have severe sleep apnea. This wasnât the first incident involving trains or the last. Learn more.
Arm pain can be caused by a wide variety of problems, ranging from joint injuries to compressed nerves. Depending on the cause, arm pain can start suddenly or develop over time. In many cases, arm pain actually originates from a problem in your neck or upper spine. Arm pain, particularly pain that radiates into your left arm, can even be a sign of a heart attack. Causes.
Arm numbness is an abnormal condition in which you feel a loss of sensation in one (unilateral) or both (bilateral) arms. The sensation may extend over the length of the arm and into the hands and fingers. Arm numbness usually arises from a lack of blood supply to an area or nerve damage. Arm numbness can also result from infection, inflammation, trauma, malignancy, and other abnormal processes. Most cases of arm numbness are not due to a life-threatening condition.