According to WebMD, aches experienced in the abdomen during pregnancy are very common and are likely caused by round ligament pain. Any movement that causes the baby to shift has the potential to create occasional pangs of discomfort in the abdominal area. It is possible that abdominal soreness can signal a more serious health issue, so WebMD advises that a woman see her doctor or midwife if she is worried.
Round ligament pain is attributed to stretching of the internal ligaments in the area immediately surrounding the uterus as the fetus grows and expands. WebMD notes that this pain is most commonly felt on the right side of the abdomen during pregnancy. As the ligaments stretch with the expanding size of the uterus, they influence the surrounding nerve tissues and occasionally create sharp jolts of pain. The ligaments themselves are also susceptible to random spasms. The severity of the pain experienced during these twinges can often worry a pregnant woman, but they are normal.
WebMD recommends consulting with a doctor or midwife if a woman experiences any alarming symptoms accompanying the round ligament pain, such as fever, bleeding, difficulty walking or pain that does not cease. The pain can also signal conditions like appendicitis, ovarian cysts or digestive cramps.