What happens when you leave colon cancer untreated and it begins to bleed?

answered:

Complications

Cancer
The natural course of untreated colon cancer includes LOCAL and SYSTEMIC effects. Local effects may include bleeding, perforation, intestinal obstruction, and growth into adjacent organs. Systemic effects include spread to other organs such as the liver and lungs. Of course, the best time to treat a cancer is as soon as it is diagnosed.
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Cancer Colon cancer Bleeding Systemic Bowel obstruction Colon Liver Local Obstruction Lung

answered:

Seek care

Cancer
Untreated, colon cancer can cause bleeding, obstruction, pain, rupture of intestines, and ultimately death. If the person refuses treatment or disease is already advanced, ask about hospice or palliative care.
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Cancer Palliative care Bleeding Bowel Colon Hospice Intestine Obstruction Palliative Rupture