Backache (noun)

Pain in the back.

Origin:

Late 16th century: from back + ache.

Examples:

1. He woke up with a bad backache and couldn't get out of bed.
2. She had been suffering from backache for several months.
3. The backache was caused by a herniated disk in his spine.
4. The doctor prescribed some painkillers to help with the backache.
5. Many people experience backache at some point in their lives, usually as a result of poor posture or a sedentary lifestyle.