Many people experience the feeling of puffy, stretched, and bloated stomach. This may be caused due to lifestyle, poor eating habits, and lack of physical activity. For some people the condition may be caused due to a weekend of festivities, while for others it may be a common occurrence. The symptoms of this condition include fullness, tightness, pain, excessive gas (flatulence), frequent burping, or belching. Given below are some of the causes of this condition.