Symptoms of ischemic colitis can include: 
Pain, tenderness or cramping in your belly, which can occur suddenly or happen over time
Bright red or maroon blood in your stool or, at times, passage of blood alone without stool
A feeling of urgency to move your bowels
Diarrhea
Nausea
 The risk of severe complications is higher when you have symptoms on the right side of your belly. This is less commonly seen compared with left-sided colitis. People with right-sided colitis tend to have more underlying medical problems, such as high blood pressure, atrial fibrillation and kidney disease. They more frequently have to undergo surgery and also have a higher risk of death.