It is estimated that one in five pregnant women can suffer from effects of pelvic pain. It is not known exactly why pelvic pain affects some women, it is thought to be a number of issues, including previous damage to the pelvis, pelvic joints moving unevenly, hormones, and the weight of your baby.
Some factors may make women more likely to develop PGP/SPD may include:
 
• A history of back / pelvic girdle pain
• Previous injury to the pelvis
• Having PGP/SPD in a previous pregnancy
• A hard physical job