The sudden enlargement and hardening of the abdomen in men is usually due to the following factors: 1. The most common factors are digestive system diseases, such as acute attacks of chronic inflammation of the gastrointestinal tract or chronic adhesive peritonitis, liver and liver diseases, gallbladder diseases such as fibrosis of the liver, cirrhosis, acute infectious hepatitis such as obstructive jaundice, acute jaundice hepatitis can cause ascites to appear in the abdomen. 2, perforation of the digestive system, such as acute gastric perforation, acute intestinal perforation, appendicitis resulting in appendiceal perforation or intestinal obstruction resulting in intestinal perforation, will appear sudden accumulation of gas in the intestine and cause the abdomen to suddenly become large and hard clinical conditions.