noun
lumbago
lum-BAY-goh/lʌmˈbeɪɡəʊ/
Pain in the lower back.
The man winces and touches his lower back as lumbago causes pain.

Etymology
Latin lumbago described weakness of the loins and lower back. The English medical term focuses on pain in that same region rather than weakness.
In context
you get up and oh boy you spasm up welcome to lumbago or severe lower back pain
More examples
- The doctor recommends gentle exercise to help manage his lumbago.
- A bout of lumbago kept me home yesterday.
- Sitting for hours makes my lumbago worse.
Forms
lumbar adjective — Relating to the lower back region.
Similar words
- backache
- Can refer to pain anywhere in the back, not just below.