Brief Answer:
there are different causes for persistent vomiting
Detailed Answer:
HI, thanks for using healthcare magic
Persistent
nausea and vomiting should be investigated.
Though intolerance to foods can result in nausea and vomiting, you indicated that she vomits even when her stomach is empty.
Persistent vomiting can be related to any of the following categories of problems: (1) visceral disease- this means a condition that involves the XXXXXXX organs of the abdomen
Examples of visceral disease are reflux, obstruction of the stomach or part of the intestine, liver disease or disease of the
gall bladder.
(2)metabolic or toxic problem
Examples of metabolic or toxic problems would be high calcium levels, alcohol,
kidney disease, side effect of medication, uncontrolled diabetes
(3)condition related to the central nervous system- this would be the brain to spinal cord
Examples of central nervous conditions would be a mass in the brain or
inner ear disease
Food intolerance should only be considered after other conditions are ruled out.
This means imaging should be done to look for any masses in the stomach and the intestines to check for any structure that may be causing the vomiting. This means a
barium meal to look into the stomach and
esophagus and possibly a CT to look into the other aspects of an intestines.
Blood tests should be done to check for abnormal electrolytes like calcium, assess the liver and kidneys.
I hope this helps, feel free to ask any other questions