The pain is usually due to inflammation or excessive pressure on the nerve root.
This condition is called sciatica and tends to affect one side of the body.
What causes a pinched nerve and why is it so painful?

The nerves on your body can be compressed by the surrounding tissues.
The pain and discomfort often worsen at night, says theMayo Clinic.
Arthritis, obesity, and other disorders can lead to nerve compression, too.

Nerve compression may also occur in people with diabetes.
Treatment usually consists of hot and cold therapy, rest, light exercise, andpain killers.