Quick answer: ACOG explains that a pregnancy hormone loosens the pelvic joints, which can lead to pain, and says exercise should not cause pain and that severe or lasting pain is a reason to call your ob-gyn.

What ACOG says

ACOG's back pain FAQ: "To prepare for the passage of the baby through the birth canal, a hormone relaxes the ligaments in the joints of your pelvis to make them more flexible. Back pain can occur if the joints become too flexible." On exercise: "Exercising should not cause pain. If you have pain, stop doing the exercise." On lifting: "squat down, bend your knees, and keep your back straight." When to call: "If you have severe back pain, or if the pain goes on for more than two weeks, call your obstetrician–gynecologist (ob-gyn) or other obstetric care provider." Your provider "may recommend that you see a rehabilitation specialist or a physical therapist."

Source: ACOG: Back Pain During Pregnancy

Questions about your own pregnancy, birth or recovery belong with your doctor or primary healthcare provider.

Related articles

• Is it safe to exercise during pregnancy?

• Which activities should I avoid while pregnant?

• When should I stop exercising and contact my provider?

• Can I lie on my back or do core work while pregnant?

MOMDAY is not a healthcare provider. This article shares general information from public health sources such as ACOG and is educational only, not medical advice, diagnosis or treatment. Always talk with your doctor or primary healthcare provider about what is right for you, and never delay seeking care because of something you read here. If you think you have an emergency, call 911 or your local emergency number.