There some causes on which you can't have influence, like for example, hormones. The hormone relaxin, which allows pelvic expansion to accommodate the enlarging uterus, increases tenfold, reaching its peak at the 14th week. Joint laxity is most notable in the lumbar spine and the sacroiliac joints. As static supports in the lumbar spine become more lax the pain from the facet joints may increase.
You may feel pain in the pelvis. In the pelvis, joint laxity is most prominent in the symphysis pubis and the sacroiliac joints. The symphysis pubis widens throughout pregnancy. With widening comes the possibility of vertical displacement of the pubis and rotatory stress on the sacroiliac joints.
You may have influence on your weight, but only partial. During third trimester, a weight of baby is forcing pregnant woman to lean backward. That, and ligaments laxity cause extreme pressure on muscles, weakness of spine and pain. Increase of amniotic fluid and development of child will add to your weight. This causes your pelvis to tip forward, which increases the curve behind your waist and puts Increase of amniotic fluid and development of child will add to your weight. This causes your pelvis to tip forward, which increases the curve behind your waist and puts a strain on the back of your pelvis.
Nocturnal pain it's also something on which you can't have influence. There are many theories about why night pain develops. One theory is that muscle fatigue accumulates throughout the day and culminates in back pain at night. Another is that biomechanical stress from sacroiliac dysfunction produces symptoms in the evening. Circulatory changes during pregnancy may also contribute to low-back pain at night.
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