Doctors note how diarrhea is the only ZES symptom some patients experience. It might take a while to get the correct diagnosis since it has so many possible causes. From a probability perspective, the likelihood that diarrhea results from eating some rotten food is much greater. However, if it is possible to eliminate all these more common diarrhea reasons, the doctor may want to check for ZES. For example, they could look for very high levels of gastrin in the patient's bloodstream.
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