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The L5-S1 joint can be vulnerable to misalignment or injury. Common causes of pain at L5-S1 include disc herniation and spondylolisthesis. Pain from L5-S1 is often treated with various methods, ...

The S1 heart sound happens when the tricuspid and mitral valves close. A loud S1 may mean there is a problem with the heart, like mitral stenosis or tachycardia. Mitral stenosis is when the mitral ...