There are several warning signs one should consider when being suspected of suffering from peritonitis. The lack of appetite is the primary symptom of the health condition. As far as peritonitis is connected with the abdominal, the typical pain in this region is another alarming sign. The ache may get worse at any moment, so the professional aid is required ASAP. With every move the patient takes, he or she may feel severe pain. Thus, the movements become limited. In addition, it is necessary to pay attention to such factors as fever, exceeded the level of fluid and extra sensitivity (in the abdominal zone), obstacles on the way to urinate, problems with gases and bowel, supported by the strong desire to vomit.