Overfeeding is the number-one cause of high nitrate levels in aquariums. Overfed fish produce much more waste than normal, and when more food is given than they can take in, the uneaten food rots and produces even more wastes. Keeping too many fish in a tank also leads to problems with accumulated wastes.
Symptoms Caused By Esophageal Ulcer. One classic symptom is a dull or burning pain. It is common with all forms of peptic ulcers. The affected person may feel the pain radiating within the areas starting from the navel up to the breastbone.
1 Chronic irritation from reflux is the usual cause of esophageal strictures. 2  Achalasia: A rare disease in which the lower esophageal sphincter does not relax properly. 3  Difficulty swallowing and regurgitation of food are symptoms. 4  Esophageal cancer: Although serious, cancer of the esophagus is uncommon.hey keep food and secretions from going down the windpipe. The lower esophageal sphincter (LES) is a bundle of muscles at the low end of the esophagus, where it meets the stomach. When the LES is closed, it prevents acid and stomach contents from traveling backwards from the stomach.