Sharp pain lower back right side. What is this?

Chris

New member
I get this sharp pain on my lower back on the right side mostly when I sit down or do anything physical such as run, jump, etc. It's fine when I walk and stand though. When I sit, it hurts for like a minute then it just goes away. I started getting this pain after suddenly running and jumping over small fences. (Don't ask why). What could this be?
 
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