A very hard abdomen is not necessarily a precursor to abdominal muscles, and when combined with abdominal pain, it may also be a perforation of the digestive tract caused by a plate-like abdomen.
Under normal circumstances, when the lower limbs are flexed so that the abdomen is in a state of relaxation, the abdomen should be flat and soft, and people who regularly exercise their abdominal muscles may have a harder abdomen, mainly due to less abdominal fat and more developed muscles. But there will be no pressure or rebound pain.
However, if the abdomen is hard, that is, the abdominal muscles are tense, and at the same time there is obvious pressure pain or rebound pain, we need to consider whether the patient is a combination of peritoneal irritation signs, and in severe cases, even plate-like abdomen. Commonly found in gastric perforation, duodenal perforation, purulent appendicitis, etc., need to go to the hospital in time.