Symphysis pubis dysfunction is a condition in pregnancy where the ligaments stretch too much and you end with pain in the back, pelvis and hips. It starts off feeling like sciatic pain and then the pain stretches to your pelvis. It can be incredibly painfull to do certain things and affects the way you can give birth too. You can get help though and see physio etc to limit the pain. Alot of woman on this site have had it including me.