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
Symptoms occur later, when the cancer may be harder to treat. The most common symptoms include: 1  Pain in the belly. 2  Blood in your stool or very dark stools. 3  A change in your bowel habits. ( 4 You may have more frequent stools or a feeling that your bowels aren't emptying completely). 5  Constant tiredness (fatigue).