Men’s hard stomach is usually caused by constipation, intestinal flatulence, intestinal tumors or other diseases, as follows: 1. constipation caused by indigestion, intestinal contents can not be discharged in time, stagnation in the intestine will lead to a hard full abdomen, this situation is generally due to poor dietary habits and lifestyle. 2. benign and malignant tumors of the intestinal tract, benign tumors are generally movable, less harmful, and will only produce pressure on the surrounding tissues; 3. malignant tumors are very harmful, even life-threatening, accompanied by fever, weakness of the limbs, and loss of weight. This is the first time I’ve ever seen a tumor in my life, stones or polyps.