Can rectal cancer be contagious?

Cancer is caused by cell carcinoma, which is a cellular disease. Rectal cancer is a disease caused by cancer in the part closest to the anus. It is not contagious and is not an infectious disease. Most early stage rectal cancers are asymptomatic. When it reaches a certain stage, there will be changes in bowel habits, bloody stools, bloody stools, tenesmus, constipation, diarrhea, etc. The stool gradually becomes thinner. In the late stage, there will be defecation obstruction, weight loss and even cachexia. When invading the surrounding tissues such as the bladder, urethra, and vagina, there will be symptoms of urinary tract irritation, fecal fluid discharge from the vagina, pain in the sacrum and perineum, and edema of the lower limbs.

Rectal cancer is not contagious. For it to be contagious, three conditions must be met: a source of infection, a route of transmission, and a susceptible population. Clinical data have proven that cancer patients themselves are not a source of infection.
In the early stage of rectal cancer, there are no symptoms or the symptoms are not obvious, only discomfort, indigestion, occult blood in stool, etc. As the cancer develops, symptoms gradually appear, manifested as changes in bowel habits, abdominal pain, blood in stool, abdominal mass, intestinal obstruction, etc., with or without systemic symptoms such as anemia, fever and weight loss. Tumor metastasis and infiltration can cause changes in the affected organs. Rectal cancer shows different clinical symptoms and signs due to its different locations.