There is a network of nerves that connect with the spine and transfers the signal to the spinal cord from your shoulder, arm, and hand called brachial plexus. The brachial plexus gets damaged when nerves get stretched or squeezed or torn from the spinal cord.
Burners or stingers are small or mild brachial plexus injuries. These types of injuries are common in games like football, or other contact games. During the time of birth, the newborn may have chances of brachial plexus injury. Conditions like tumors and inflammatory disease can also affect the brachial plexus.
Road accidents cause the most serious brachial plexus injuries (motorbike). Severe brachial plexus injury can cause paralysis of the arm.