Probably because the back is a collection of parts old your body, such as several muscles, muscle groups and nerves etc…
As a kid I learned a lot of my back pain was caused by my legs, with muscle tightness pulling my back in odd directions
Your abs are a muscle group that wrap around to the small of your back, if there is an imbalance or poor strength other muscle groups could have to pick up the slack.
Have the issue i would guess is figuring exactly what is causing your issue
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