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.
1. Trauma or Injury. One of the most common causes of severe upper arm pain is an injury to one or more of its parts. A fracture (broken bone) or a sprain in the arm due to a fall may result in extreme upper arm muscle pain. The symptom might not be experienced immediately but it may develop gradually as you move your arm.