Abdominal, pelvic, or back (flank) pain during pregnancy

An ectopic pregnancy (tubal pregnancy or extrauterine pregnancy) occurs when a fertilized egg attaches (implants) to an area outside of the uterus. Abdominal or pelvic pain that occurs with a missed period early in pregnancy is the most common symptom of ectopic pregnancy and occurs in about 75% of women who have an ectopic pregnancy.

In an ectopic pregnancy, the embryo may implant in a fallopian tube, ovary, or in the abdomen. These organs are not designed to hold the growing embryo. Pain develops when the embryo grows and the implantation site is not able to stretch to accommodate it.

Pelvic or lower abdominal pain caused by ectopic pregnancy may get worse when you move or strain. The pain may occur sharply on one side at first and then spread throughout the pelvic region.

Severe cramps during pregnancy, with or without heavy bleeding, may be a sign of a miscarriage. The cramping can be severe and incapacitating or mild. You may also pass large blood clots or grayish or pinkish tissue.

Abdominal pain during later pregnancy, especially close to delivery, can be caused by other problems, such as premature labor or placenta abruptio. Call your health professional for instructions if you have moderate to severe abdominal pain at any time during your pregnancy.

Pain in the back just below the rib cage on one side of the body is called flank pain. Flank pain with fever and urinary symptoms may indicate a kidney infection (pyelonephritis). Call you health professional, if you have flank pain or other signs of a kidney infection.