<unk>  is not a specific condition, but rather a description of a problem in which one or more nerves are affected and do not work properly (a neuropathy). The emphasis is on the nerve root ("radix" = "root"). This can result in pain (radicular pain), weakness, numbness, or difficulty controlling specific muscles.
Radiculopathy
Myopathy
Diabetic neuropathy
Peripheral neuropathy
Tendinopathy
Myelitis
Myositis
Optic neuropathy