What are symptoms of a ruptured spleen?

Abdominal Pain: The spleen is a very vascular organ. Significant trauma may cause internal bleeding within the abdominal cavity. Blood is an irritant to the lining of the abdomen, causing pain wherever the blood may be. While the spleen resides behind the rib cage in the left upper abdomen, the pain can occur wherever the blood goes. If severe, the anemia can cause a rapid heart rate and/or lightheadedness.