Stomach ache may be due to any of the causes of stomach ache that affect those of us who are not pregnant (pregnant women are not immune to such disorders as appendicitis, gallstones or indigestion - described in the section on the digestive tract) but they are more at risk of those causes associated particularly with pregnancy such as placental abruption (where some or all of the placenta peels away from the uterine wall) or degeneration of a fibroid or torsion of an ovarian cyst. Abdominal pain of abrupt onset, particularly if it is increasing in severity, needs to be assessed. Because it might, of course, be the onset of labour.