Radiating pain, usually down the legs or arms.

• A. Paresthesia
• B. Radius
• C. Radiculopathy
• D. Pulmonary

Answer: (C)

Radiating pain down the leg or arm points to radiculopathy—the irritation or compression of a spinal nerve root. When a nerve root is irritated, the pain travels along the nerve’s path into the associated limb, producing a shooting or electric-like sensation that follows a dermatomal pattern, such as when lumbar roots cause sciatica or cervical roots affect the arm. This pattern helps distinguish radiculopathy from simple paresthesias, which are abnormal sensations like tingling or pins-and-needles that aren’t necessarily painful along a nerve distribution. The other options don’t fit: the radius is a forearm bone, and pulmonary relates to the lungs, neither of which explains radiating limb pain.