Ay, ang back pain sa 25 weeks na yan talaga, ramdam ko din yan dati! Best thing for me was palagin ko yung pillows sa likod kapag natutulog, at during the day I'd try to sit with proper posture, easier said than done, I know, kasi ang bigat na talaga ng baby. Also, prenatal massage or warm compress helped a lot, at lagi akong nag-stretch ng mabagal lang. Pero honestly, check with your OB about it din para ma-rule out kung may iba pang reason, kaya lang naman to be safe, especially kung sobrang sakit na talaga. You're at the stage na where baby's getting heavier na kaya normal lang ito, pero your doc will know best kung paano i-manage best for you!