My lower right back spasms when I attempt to straighten

Patient: My lower right back spasms when I attempt to straighten it and I expierience severe pain when I bend or twist a certain way. I look in the mirror and I am passively leaning to one side quite a lot. I am leaning to the opposite side of pain so leaning left. What could this be. I don’t remember hurting my back. It’s gotten worse last 2-3 days

Doctor: