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There are many possible causes of upper abdominal pain. A common cause of pain in the upper abdomen would be an acid irritation syndrome, such as a gastritis. This can occur as a primary problem, but also can occur related to the stress of a acute illness.
It is also common to get abdominal pain from a viral infection of the gut, and this is frequently associated with nausea, vomiting, or diarrhea.
Other possible causes of upper abdominal pain are less likely, such as gallbladder disease or pancreatitis.
Chronic jaw pain can be due to inflammation of the joint of the jaw or from allergies. If there are allergies, it ca also contribute to the development of a sinus infection.
At this point, it would be reasonable to first try a medicine to suppress stomach acid, such as ranitidine or omeprazole.
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