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.
Appetite and weight loss are other symptoms of a stomach ulcer. Persons with duodenal ulcers may experience weight gain because the persons eats more to ease discomfort. Recurrent vomiting, blood in the stool and anemia are also symptoms of a stomach ulcer. In severe cases, symptoms of a stomach ulcer may include: 1  Dark or black stool (caused by internal bleeding). 2  Vomiting blood (vomit may be grainy and black like coffee-grounds). 3  Weight loss. 4  Severe pain in the mid to upper abdomen.