Gastrointestinal cancers refer to a group of cancers that affect the digestive system, including the esophagus, stomach, small intestine, colon, and rectum. These cancers can vary in type and severity, with common forms being colorectal cancer and gastric cancer. Symptoms may include changes in bowel habits, abdominal pain, and unexplained weight loss. Risk factors for gastrointestinal cancers include age, family history, and certain lifestyle choices such as diet and smoking. Early detection through screenings, like colonoscopy, can improve treatment outcomes. Treatment options often involve surgery, chemotherapy, and radiation therapy, depending on the cancer's stage and location.