Symptoms. People will feel discomfort in the stomach, especially the upper area. The pain is typically described as feeling like burning. This can be accompanied by nausea and vomiting. In addition, you can experience belching refers to air from the stomach being released through the mouth. Another symptom is bleeding within the stomach. People will notice the blood as it can be released in their vomit or stool. Some experience satiety (feeling full) after having a little bit to eat. This may lead to a decline in appetite and possibly weight loss. Additional symptoms for gastritis include hiccups and diarrhea.