Your UPPER back? Have u tried changing ur posture? Maybe drink more water. Im 33 weeks and started using a heating pad on my hip cuz it just started getting to me. I've never heard of pregnancy hurting ur upper back.
Like the girl above heating pad works wonders. A warm bath. Tylenol.
Try wearing a more supportive bra :) your boobs may just be growing.
I know right , everyone's telling me theyve never heard of upper back pains. But yeah maybe its the bra I've been drinking tons of water :)!
Upper back pain isn't caused from the pregnancy but you can use heat, ice, and tynenol for pain while preggers.