There is no way to say without exam.
However, there are a number of possibilities.
Inflammation of the esophagus.
Stomach emptying problem.
Infection of the GI track, but this would usually resolve.
Other problems, such as any more serious illness, for example, liver, or kidney disease.
And other problems.
This is really not a self diagnosis situation.
And labs to not direct a diagnosis.
Diagnosis directs labs.
So, she needs to see a doctor, bot***** *****ne.
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