Why do you get lower back pain during pregnancy?

First, it depends WHERE in your back you feel pain. As one example, Flank Pain (on the sides, right above the waist/hips) can be a kidney infection. Second, it depends on HOW much you weighed before and now. Third, it depends on WHAT trimester you are in, and WHETHER you had any prior back pain.

Generally speaking, and directly related to pregnancy (without any other minor or major non-pregnancy cause), pregnant women can have abdominal or back pain as the uterus stretches, the fetus grows, and as the woman puts on extra weight. Women can have hip pain as hormones begin to stretch and relax ligaments; this can worsen in the third trimester in preparation for birth.
First, it depends WHERE in your back you feel pain. As one example, Flank Pain (on the sides, right above the waist/hips) can be a kidney infection. Second, it depends on HOW much you weighed before and now. Third, it depends on WHAT trimester you are in, and WHETHER you had any prior back pain.

Generally speaking, and directly related to pregnancy (without any other minor or major non-pregnancy cause), pregnant women can have abdominal or back pain as the uterus stretches, the fetus grows, and as the woman puts on extra weight. Women can have hip pain as hormones begin to stretch and relax ligaments; this can worsen in the third trimester in preparation for birth.