You don't have to live with the pain. Some of the basic contributing factors to all of this discomfort during pregnancy include hormonal changes, extra weight in the front of the body, and muscle imbalance, which leads to spinal and pelvic misalignment.
Pregnant women secrete the hormone, relaxin, which causes ligaments to expand.
This increased flexibility of the ligaments dramatically reduces the support of your back and pelvic joints. This, in turn, is really just your body's way of preparing for the birth process. Our abdominal muscles are excellent lower back stabilizers. With the increased weight up front, the stretching of the abdominal muscles, and the forces of gravity, the lower back and pelvis are under a great deal of strain. Add this all up, and you have a body that is gaining weight, size, and lack of proper support.