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 Peptic ulcers are sores that develop in the lining of the stomach, lower esophagus, or small intestine. 2  The most common symptom of a peptic ulcer is burning abdominal pain that extends from the navel to the chest.  Untreated ulcers can become worse over time and lead to other health conditions.