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 & screens. Symptoms that may indicate the presence of cancer cells in the colon or rectum include blood in bowel movements, weight loss, stomach pains and constipation or diarrhea. Often, individuals will not experience any symptoms of colon cancer until it has become advanced.