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 spasms are caused when muscles in the arm contract uncontrollably. It can be felt as quick jab of pain or a throbbing annoyance. If a person has an arm spasm while doing a dangerous task, they could be seriously injured or killed. There are so many causes of arm spasms that sometimes they are hard to diagnose.nother possible cause of spasms in the arm is an injury to the spinal cord. The brain sends messages to muscles through the spinal cord. If the messages are not properly transmitted in the spinal cord, the muscles in the arm will not contract correctly. This will cause the arm to have spasms.