hello,
pains comming from stomach may have many origins. Your mother's problem does not seem to me related with her previous intervention.
One of the most comon reasons is
gastritis, ulceration etc. In such a case in general the pain is not the same all the time, it may be stronger early in the morning, and in the spring and autumn. Also can be calm down after eating, drinking milk etc.
Some of the factors of the risc for this disease are smoking, stress, coffee, alcool, spicy food etc.
An other origin can be a inflamation of the
pancreas. The most common symptoms of
pancreatitis are severe upper abdominal burning pain radiating to the back, nausea, and
vomiting that is worsened with eating.Eighty percent of cases of pancreatitis are caused by alcohol and gallstones.
I suggest her to effect a fibroscopic examination and
blood test to measure her amylase.
Kind regards