While spinal nerve impingement can cause shooting arm or leg pain, many patients have instead pain from nerve entrapments. Common entrapments include Alcock canal, carpal & tarsal tunnels, meralgia paresthetica, and more than 50 others. Treatment starts with accurate diagnosis by specialist physicians familiar with the complex nerve anatomy and ultrasound visualization of the nerves.
Here is the clinical nerve diagram for the arm.
And the nerve diagram for the leg: