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.
In some cases, the feeling of pins and needles in your left arm can be caused by an underlying problem like trauma or injury, diabetes, brachial neuralgia, a heart condition, multiple sclerosis or nerve damage. In these cases, treatment might require more drastic measures like chemotherapy, surgery or medication.