Jisho

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Noun
1. lower back pain; lumbago
Wikipedia definition
2. Low back painLow back pain or lumbago is a common musculoskeletal disorder affecting 80% of people at some point in their lives. In the United States it is the most common cause of job-related disability, a leading contributor to missed work, and the second most common neurological ailment — only headache is more common. It can be either acute, subacute or chronic in duration. With conservative measures, the symptoms of low back pain typically show significant improvement within a few weeks from onset.
Read “Low back pain” on English Wikipedia
Read “腰痛” on Japanese Wikipedia
Read “Low back pain” on DBpedia

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