sciatica

This term refers specifically to a clinical symptom rather than a disease itself, describing the radiating pain caused by compression of the sciatic nerve. It is typically used in medical contexts or patient descriptions to specify the location and nature of the pain, distinguishing it from general lower back pain.

As a medical condition describing a specific type of nerve pain, the word is treated as an uncountable noun. It does not have a plural form and is not used with indefinite articles like "a sciatica"; instead, it is often paired with counters such as "a bout of" or "a case of" to describe individual episodes of the condition.