Rectal Ca is the abbreviation of rectal cancer, which is the usual term for rectal cancer. Because when clinical cases are written, in order to protect patients’ privacy and avoid patients knowing in advance that they are suffering from malignant disease, which leads to excessive psychological burden, they will abbreviate and form rectal cancer into rectal Ca. The incidence of rectal cancer is gradually increasing in China, and the main manifestations include changes in bowel habits, which is a common early symptom of rectal cancer, patients have more frequent stools and a particularly strong sense of incomplete stools, and some patients even Some patients even have more than ten times a day. Another symptom of rectal cancer is bleeding, which is dark black and can be distinguished from hemorrhoids. Finally, if rectal cancer develops further, patients will have thinner stools because as the tumor grows, it will compress the intestinal cavity and make it difficult to pass stools, which will lead to constipation. Therefore, if the above symptoms are found, early examination and treatment should be carried out as soon as possible.