A pinched nerve occurs when there is “compression” (pressure) on a nerve.
The pressure may be the result of repetitive motions. Or it may happen from holding your body in one position for long periods, such as keeping elbows bent while sleeping.
Nerves are most vulnerable at places in your body where they travel through narrow spaces but have little soft tissue to protect them. Nerve compression often occurs when the nerve is pressed between tissues such as:
For example, inflammation or pressure on a nerve root exiting the spine may cause neck or low back pain. It may also cause pain to radiate from the neck into the shoulder and arm (cervical radiculopathy). Or pain may radiate into the leg and foot (lumbar radiculopathy or sciatic nerve pain).