what cause stomach to be hard and gain weight
1 These symptoms are common and are usually not a matter of concern. 2  Constipation: Constipation is a condition when one does not pass stools regularly or has difficulty in passing stools due to their hard nature. 3  Pain in stomach, bloating, nausea, weight gain, cramps, etc., are the symptoms of constipation.t causes a lot of discomfort and also makes the person irritable. It is a common symptom of conditions like irritable bowel syndrome, constipation, etc. However, bloated stomach and weight gain, together, is a rare symptom observed only in case of certain health conditions.