what would cause blood in my urine and stool
Most likely, the blood in your stool - something doctors call hematochezia - is related to a less serious condition. However, if bleeding is cancer-related, colorectal cancer and anal cancer are two types of cancers that can cause rectal bleeding or blood to be present in the stool.
Some non-cancerous causes of blood in stool include: 1  Hemorrhoids - Internal hemorrhoids are the number one cause of rectal bleeding, and are essentially dilated veins found within the rectum. 2  Anal fissures - Anal fissures are tears in the anus and can be acute or chronic.