 [ Symptoms ] brain tumor ok i have headaches around the same time of the day and when i look in the mirror my pupils are different sizes the headaches are always in the right side in the front of my head like behind my eye or something the pain is soo bad sometimes i can barely stand it im 17 could this be a brain tumor  benign or cancerous [ Disease ] well peritonitis can cause rapid spread of infection if it is severe and can lead to multiple organ failure so it is better to avoid delay and consult a physician or gastroenterologist and get evaluated immediate medical and surgical intervention is a must hope this helps