Thank you for the query.
When stomach pain is present with nausea and all tests are normal, most likely the cause is peptic ulcer
. This is hardly visible in ultrasound
and does not give any lab tests changes. The best way to diagnose it is and upper GI endoscopy
with Helicobacter Pylori
test. She should also have liver tests, pancreas tests and stool tests performed.
Hope this will help.