The zone is named after one of the diagnostic species. Oppel zones are thus more flexible and subjective than concurrent range zones in the rigorously applied sense of that term, although the term âconcurrent range zoneâ is commonly used for what is, in fact, an Oppel zone.Cite this article. Pick a style below, and copy the text for your bibliography.he zone is named after one of the diagnostic species. Oppel zones are more flexible and subjective than concurrent range zones in the rigorously applied sense of that term, although âconcurrent range zoneâ is commonly used for what is in fact an Oppel zone. Cite this article.
The most frequent causes of abdominal pain are gastroenteritis (13%), irritable bowel syndrome (8%), urinary tract problems (5%), inflammation of the stomach (5%) and constipation (5%). In about 30% of cases, the cause is not determined.
In fact, some doctors have suggested that stressful situations trigger the stomach to produce more stomach acid, which causes symptoms that resemble heartburn. Some of the key causes of nervous stomach are: 1  Stomach ulcers and acid reflux disease (GERD) and irritable bowel syndrome (IBS).2  Changes in digestive enzymes. 3  Food allergies and the intolerance of specific foods. 4  Eating foods that spicy, oily, high in fat, as well as fast foods.n fact, some doctors have suggested that stressful situations trigger the stomach to produce more stomach acid, which causes symptoms that resemble heartburn. Some of the key causes of nervous stomach are: 1  Stomach ulcers and acid reflux disease (GERD) and irritable bowel syndrome (IBS).