The occurrence of colorectal cancer has a lot to do with our lifestyle. What are the early signs of colorectal cancer? 1.Gastrointestinal symptoms: abdominal distension, indigestion, discomfort or symptoms. Right half of colorectal cancer cancer, abdominal discomfort or pain. At the beginning, it may be intermittent and turn to persistent, often located in the right lower abdomen, such as chronic appendicitis; while the left half of colorectal cancer obstruction, for more manifestation is sudden, abdominal cramps, accompanied by abdominal distension, hyperperistalsis, constipation and obstructed exhaustion, or chronic obstructive symptoms such as abdominal distension and discomfort, paroxysmal abdominal pain, hyperactive bowel sounds, constipation, blood and mucus in stool. 2.Changes in bowel habits: the early manifestation of right hemicolectomy cancer is pus and blood stool, lean, increased number of bowel movements, when the tumor continues to increase affecting fertilizer can also occur alternately through diarrhea and constipation, appear; left hemicolectomy cancer for more performance of bowel difficulties and increases with the development of the disease. In addition, if the cancer is lower, can also appear poor defecation and downward feeling. 3.Blood or mucus stool: right half of colorectal cancer cancer, a small amount of bleeding and peristalsis of colorectal cancer, which is fully mixed with stool, resulting in not easily visible to the naked eye, but positive occult blood test; while left half of colorectal cancer cancer blood and mucus are not mixed with stool, about 1/4 of patients can be observed in the stool of blood and mucus. 4.Abdominal pain: Initially, it is vague pain with irregular attacks, which is not necessarily related to stool. With the appearance of intestinal obstruction, abdominal pain may increase. 5, wasting, anemia. 6.Intestinal obstruction: The intestinal cancer gradually increases, which may partially or completely block the intestinal cavity and produce incomplete or complete intestinal obstruction. Abdominal pain, abdominal distension, diarrhea-like stool at the beginning, and no stool later, or even nausea and vomiting may occur. 7.Other symptoms: the cancerous tumor in the intestine increases in size, and sometimes the abdominal mass can be found on its own. If it infiltrates outside the intestine, there may be ascites. If it metastasizes to the liver, the liver may be enlarged and hard, and even a lump may be found, or there may be jaundice. Metastasis to the supraclavicular lymph nodes may show enlarged and hard lymph nodes, etc.