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.
This condition is called l eukocytosis. Severe esophagitis can cause ulcers (sores or lesions that may bleed) in the lining of the esophagus. Other symptoms include the following: 1  Abdominal pain (e.g., pain in the upper center of the abdomen [called epigastric pain] or behind the breastbone [called retrosternal pain]). 2  Fever and chills. 3  Nausea and vomiting. 4  Persistent cough.