Back hurting after 3 days at the job?

Juststrollinagain
Hey guys, I am extremely bothered by this fact. I don't know know why but my lower back hurts in retail. And I am doing less work than I had. I worked at the same store in a different location for 3 months last year and I never had back pains.
Now I work in a new store and boom my lower back hurts. I have no idea what's going on smh I am so worired it was just 3 shifts!! Im 25!
Back hurting after 3 days at the job?
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