The medical term is radiculopathy — a condition where a spinal nerve root is compressed, irritated, or inflamed at the point where it exits the spine. Symptoms follow the path of that specific nerve, which is why pinched nerves cause radiating pain, numbness, tingling, or weakness that travels.
The nerve doesn't have to be physically 'pinched' to behave this way. Inflammation around the nerve root — from a disc, a swollen joint, or surrounding muscle tightness — can cause identical symptoms even without significant mechanical compression. That's important because it explains why anti-inflammatory care (rest, ice, traction, soft tissue work, gentle motion) often resolves symptoms even when imaging still shows the underlying anatomy.
Pinched nerves are most common in the cervical spine (causing arm symptoms) and the lumbar spine (causing leg symptoms — which is what sciatica is). Less commonly, peripheral nerves get entrapped further along their path — carpal tunnel, ulnar nerve at the elbow, piriformis-related sciatic irritation. Each pattern has its own assessment.