Thank you for the additional information.
It certainly is very common for upper abdominal pain to be related to an acid irritation syndrome, such as acid reflux, gastritis, or ulcers. So, it is reasonable in someone with typical symptoms to first be treated with a medicine to suppress stomach acid, such as the Prilosec or Zantac. However, if the symptoms do not improve, it is reasonable to consider other possible causes of upper abdominal pain.
Certainly, gallstones are also fairly common, and while it will more often cause pain in the right upper abdomen, it can sometimes cause pain in the center upper abdomen. It is also very typical for gallstone pain to get worse after a meal, and particularly after a meal that has more fatty foods.
Another possibility to consider would be pancreatitis. Pancreatitis is far less common than an acid irritation syndrome or gallstones, but it is still fairly common and should be considered if the pain is persistent and no other cause can be identified.
The usual tests for the above problems would be additional blood tests, and particularly enzymes of the pancreas, along with an ultrasound of the gallbladder.
It is also possible for nerve pain to be felt in the abdomen. Since nerves run throughout the body, nerve pain can also be felt in various locations throughout the body. It is not as easy to test the nerves in the abdomen as it is for other areas of the body, but if the pain is persistent in someone with known nerve pain elsewhere, it would be reasonable to consider additional treatment oriented towards nerve pain to see of the abdominal pain improves.
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