With the change of people’s diet structure, the occurrence of rectal cancer is getting younger and younger. The appearance of a series of early symptoms of rectal cancer reminds patients not to take it lightly. Especially for female patients, there will be some special early symptoms, if these symptoms appear, we should be alert to the occurrence of rectal cancer. 1.Abnormal leucorrhea When cancer cells start to spread, other co-morbidities will occur, and then the leucorrhea will appear abnormal, such as increase and color change. This is also one of the early symptoms of female rectal cancer. This is because when the cancer cells invade the prostate or bladder, there will be some difficulties in urination, such as painful urination, frequent urination and urgent urination. So this is also one of the early symptoms of rectal cancer. 3.Blood in stool Early symptoms of rectal cancer can appear blood in stool, the amount of blood is not much and the color of blood is bright red, attached to the surface of stool. As the cancer cells continue to grow, it is easy to infiltrate the intestinal cavity, resulting in narrowing of the intestinal cavity, causing constipation and difficulty in defecation. In severe cases, patients may also experience discomfort in the lower abdomen and even alternate constipation and abdominal leakage, among other early symptoms of rectal cancer. In severe cases, patients may experience discomfort in the lower abdomen, or even constipation and abdominal leakage alternately. Anyone above 40 years old with any of the following symptoms should be classified as high-risk group: 1. first-degree relatives with history of colorectal cancer; 2. history of cancer or history of intestinal adenoma or polyps; 3. positive stool occult blood test; 4. two of the following five symptoms: mucus and blood stool, chronic diarrhea, chronic constipation, history of chronic appendicitis and history of mental trauma. High-risk groups should be checked regularly to be alert to the occurrence of bowel cancer.