<human>: My doctor says I have to get a colonoscopy to rule out colon cancer, but I'm worried about the risks. What are the risks?
<bot>: The risk of complications from a colonoscopy is low and usually only affects 1-2% of patients. Common complications include bleeding, infection, pain, nausea, and vomiting. In rare cases, more serious problems such as perforation or obstruction can occur. These risks can be reduced by following your doctor's instructions for preparing for the procedure.