Get to the ER if you’re pregnant, have recently had an operation, you develop a bruise or recently had abdominal trauma.
If this doesn’t apply to you, still get to the ER if additional symptoms develop if your abdomen becomes tender or hard, if you become nauseous, the pain spreads (especially to the chest), develop diarrhea, difficulty breathing or become faint.
Call your family doctor if the pain doesn’t get better (but hasn’t gotten worse either), but still hasn’t gone away after a couple of days.