What r causes of rigid stomach?

The causes of rigid abdomen: Acute cholecystitis acute salpingitis appendicitis cholangitis gangrenous gallbladder intestinal infarction irakanji sting kidney stones penetrating abdominal wound perforated bowel perforated peptic ulcer peritonitis post operative peritonitis puerperal infection spontaneous bacterial peritonitis if you have a rigid abdomen and have been in pain that you cannot tolerate and it's been going on past four hours, you need to go to the er for evaluation.

Muscle spasm: Anything that causes the abdominal wall muscles or the stomach muscles to go into an extended contractual state will cause the 'stomach' to become rigid. I put the word stomach in quotes because it may the abdominal wall muscles overlying the stomach that is rigid. This can be done voluntarily (like making a muscles) or involuntary due to, for example, pain.