A pain or ache in the back, usually the lower back, often caused by poor posture, injury, or strain.
From 'back' (the rear part of the human body) + 'ache' (a continuous pain). Both words are ancient Germanic roots that combined into a compound word to describe a specific type of pain.
Backache is one of the most common reasons people visit doctors in developed countries, yet it's still kind of mysterious—in about 85% of cases, doctors can't pinpoint exactly what's causing it, which is why stretching and movement work better than we'd expect.
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