Rectal cancer will change the shape of stool.
The primary lesion of rectal cancer is in the rectum, with the continuous growth of tumor, the intestinal lumen will be narrowed, and the stool will be squeezed when passing through, thus the shape will be changed, which is more typical that the stool will become thinner, flatter, or concave, etc. If the tumor blocks the intestinal tract completely, then constipation and inability to defecate will occur.
If the tumor completely blocks the intestines, constipation and inability to defecate will occur. In addition to changes in the shape of stool, rectal cancer will also be accompanied by changes in the color of stool, defecation habits, bloody stools, increase in the frequency of stool, diarrhea and constipation, etc. If the above phenomenon exists for a long time, it is necessary to carry out colonoscopy, abdominal CT and pathological tissue examination in time.