Stomach discomforts have quite a number of reasons to happen. Indigestion, constipation, and consumption of high-calorie foods all day, are just some of the reasons. But whatever the reason may be for upper stomach discomfort, this condition tends to spoil one's appetite and zest for life. This is because, stomach being the powerhouse of digestion, is quite susceptible to various stimuli, which can cause upper abdominal discomfort as a symptom.