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.
Sometimes, people with esophageal cancer do not show any of these symptoms. Or, these symptoms may be caused by a medical condition that is not cancer. 1  Difficulty and pain with swallowing, particularly when eating meat, bread, or raw vegetables. 2  As the tumor grows, it can block the pathway to the stomach.