Nausea and loud rumbling in stomach? what can cause this?

Need evaluation: Nausea & "rumbling" can be caused by lots of things & may originate from disease outside the GI tract. Further evaluation is in order before anyone can answer "what to do." your doctor will want to re-examine you as well as know the quality, timing, duration, location, & associations (eating, position, activity, stooling, urinating) of your symptoms to better direct the next appropriate testing.