Whats the signs of colon cancer?

None really...: In the majority of patients (over 80%), colon cancer is silent. Symptoms and signs of altered stool pattern or appearance, weight loss, blood in the stool are often late manifestations of advanced disease. Unfortunately, these signs are nonspecific, and can present with many other GI issues--so don't freak out if you are experiencing them. Just get checked.

Blood in stools: Passing blood in stool is one of the signs of late colon cancer. Your doctor checks for fecal occult blood which can be positive in many other conditions. Having regular colonoscopy is the best way to avoid this disease.