Blood clots, especially those that originate in the brain, can occur very quickly. If there are lots of veins around to adequately redirect blood flow, the clot will stop growing at a certain point and the body can accommodate it indefinitely. It may even disappear with time.
Signs and symptoms of colon cancer include: A change in your bowel habits, including diarrhea or constipation or a change in the consistency of your stool, that lasts longer than four weeks Rectal bleeding or blood in your stool
Colon Cancer Early Symptoms. Unfortunately, in most cases of colon cancer, early symptoms do not occur. Signs and symptoms generally develop only after the disease has spread beyond its earliest, most treatable stages. Once symptoms do appear, they may include blood in the stool, abdominal discomfort, and change in frequency of bowel movements.