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.
If these symptoms are due to serious heart conditions, they often will be accompanied by other serious symptoms, including difficulty breathing, bluish coloration of the lips or fingernails, and pain in the shoulder and arm. In some cases, esophagus symptoms may be a sign of a serious or life-threatening condition.