Lower Left Back Pain More Condition_symptoms What Is This Pain In My Lower Left Side Of My Back Under My Ribcage?

What is this pain in my lower left side of my back under my ribcage? - lower left back pain more condition_symptoms

I have had back pain on the left side of the chest, a few days now. It feels like a strained muscle, but it is getting closer. It's just a muscle, or it could be something else?