Colorectal cancer is one of the common malignant tumors in the digestive system, and the early symptoms are not obvious, so there is no such thing as ten signs. With the development of the disease, some patients will show changes in stool habits and traits at the earliest, and slowly show symptoms such as loss of appetite and weight loss. Abnormal defecation: 1. Change of stool habit: Due to the spread of cancer cells, the growth of cancer tissue swelling will stimulate the intestinal tract causing accelerated gastrointestinal peristalsis, which may lead to increased defecation, and in heavier cases, diarrhea and incomplete defecation. With the spread of cancer cells and the growth of tumor, especially in the left hemicolectomy, the blockage of cancer may cause intestinal obstruction, resulting in constipation; 2. Pus and blood stool: because the stool often comes into contact with the tumor and rubs against it, blood in the stool may occur. Weight loss: After suffering from colorectal cancer, patients will have a decreased appetite due to the invasion of cancer cells into body tissues. Due to the long-term reduction of food, the body can not get the required nutrients and gradually lose weight. Anemia: With the continuous rupture and bleeding of the cancer, patients may become anemic and experience pale lips, nail bed and lid conjunctiva, as well as dizziness and weakness. Pain: Patients will have abdominal discomfort, such as pain in the abdomen and a feeling of falling. Some patients can also touch a lump in the abdomen, mostly on the right side, which varies in size, is relatively hard and may be painful to press. Since the clinical manifestation of colorectal cancer is not specific, it is often easy to be ignored by patients even if it appears. Therefore, it is recommended to seek medical treatment in time when the above symptoms appear, and perform rectal finger examination, colonoscopy, stool routine and other examinations to clarify the disease. Early diagnosis and treatment can help improve the prognosis of colorectal cancer.