Hardness in the stomach may be caused by constipation, peritonitis, abdominal tumor. 1. Constipation: This kind of people may have hard stomach due to the accumulation of feces in the intestines, which may be accompanied by abdominal pain and bloating, etc. Lactulose and polyethylene glycol can be taken to promote fecal excretion. 2. Peritonitis: this kind of people can have symptoms such as abdominal muscle tension, pressure pain, rebound pain and so on, therefore, you can touch the hard symptoms of the abdomen during the examination, such as bacterial peritonitis can be treated by ceftriaxone, ceftazidime and other drugs. 3. Abdominal tumors: when abdominal tumors appear, hard lumps can be touched on the surface, and there are symptoms such as abdominal pain, abdominal distension, etc. Once the tumor is touched by this kind of people, it is necessary to determine the benign or malignant nature of the tumor through pathological biopsy in time, and then surgical treatment should be taken in time. The above mentioned drugs need to be applied under doctor’s advice, and timely consultation is recommended.