I. Change of stool habit and shape: change of defecation habit, diarrhea or constipation, feeling of incomplete defecation, feeling of anus dropping before defecation, progressive thinning of stool, and lower abdominal pain in late stage.

Two, blood in stool: it is one of the most common symptoms in the early stage, although common, but atypical. In the early stage when the tumor is small, the symptom of blood in stool usually does not occur, but with the growth of the tumor, due to various reasons, mucous membrane erosion, ulceration or tumor rupture occurs bleeding phenomenon.

Third, pus and blood stool and mucus stool: fecal examination of rectal cancer not only has positive occult blood, but also there are pus cells and mucus mixed in feces, when the mucous membrane of tumor surface is broken, secondary infection is likely to occur due to a large number of bacteria in the intestinal tract, and because of the tissue detachment and large amount of exudate from the tumor, the chances of occurrence of pus and blood stool and mucus stool will be quite high.

Four, acute and chronic intestinal obstruction: this is because the tumor invasion leads to the narrowing of the intestinal tube, it will cause intestinal luminal obstruction complete or incomplete intestinal obstruction, which manifests as progressive aggravation.

Fifth, abdominal pain: that is because abdominal pain symptoms occur in patients with rectal cancer caused by local invasion of tumor, intestinal irritation or intestinal obstruction, perforation, etc. When chronic intestinal obstruction occurs, abdominal distension, hyperactive bowel sounds and paroxysmal colic can occur.

Sixth, anemia: it is mainly because of acute or chronic bleeding, and also because of the tumor leading to intake disorder or gastrointestinal dysfunction and tumor's damage to hematopoietic system, all of which are the reasons leading to anemia in patients.

Seven, systemic cachexia: this is the main symptom of advanced rectal cancer, patients will have symptoms such as loss of appetite, emaciation, fatigue, anemia, jaundice or ascites.

The above is the detailed content explained by Beijing expert Zhang Xiulan, hope it can help you, and wish you a good recovery.