Fever after colonoscopy is usually not related to the colonoscopy itself, and is considered to be related to lesions in the intestines themselves, such as acute gastroenteritis, inflammatory bowel disease, or may be caused by other diseases such as respiratory tract infections. Colonoscopy does not usually cause inflammatory diseases, so the fever after colonoscopy is mostly unrelated to the test. Fever after colonoscopy is considered to be related to the lesions of the intestinal tract itself, such as acute gastroenteritis patients, fever, abdominal pain, diarrhea, nausea, vomiting and other symptoms; inflammatory bowel disease acute attack can also have fever, and the degree of fever will gradually become heavier with the development of the disease. In addition, fever after colonoscopy may also be caused by respiratory tract infection, when viruses, bacteria and other pathogenic microorganisms infect the respiratory tract can occur after pneumonia, acute bronchitis and other diseases, resulting in fever. Fever after colonoscopy is recommended to go to the hospital and ask the doctor to make a judgment to clarify the specific cause of the disease.