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
Other Symptoms of Colon Cancer. In addition to gas and bloating, here are additional signs and symptoms of colon cancer. Note that most people who have gas and bloating (and even other signs and symptoms) don't have colon cancer. A feeling of needing to have a bowel movement, even if you don't.