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 into 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. Blood in stool The early symptoms of rectal cancer may include blood in stool, the amount of blood is not much, and the color of blood is bright red and 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 and even constipation and abdominal leakage alternately.