Hi.
Thanks for your query and an elucidate history.
I have read your wife's history and understood Her problem.
The causes of the pain in upper abdomen in a female patient.
Nausea is common with any sort of problem of the abdomen is just an indication that something is not alright in the abdomen.
The character of the pain which you explained is called spasmodic pains. This occurs in case of
intestinal obstruction. or some problem in the initial (proximal) part of
small intestine. She also have a back-pain , you say,.
I would advise in such a patient the following:
Standing X-ray of the abdomen.
Enteroclysis
Ultrasonography of the whole abdomen to start with and confirmatory
CT scan of the abdomen if something is positive.
Relevant blood, urine and stool tests after a clinical examination
The treatment will depend upon the final diagnosis.