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.
Back to top. An ulcer may or may not have symptoms. The most common symptom for both duodenal and gastric ulcers is abdominal discomfort, a gnawing or burning feeling. This discomfort is felt anywhere between the navel and the breastbone, and is usually a dull or burning pain.